panel.widgets package#

Submodules#

Module contents#

Panel widgets makes your data exploration and apps interactive#

Panel provides a long range of basic and specialized widgets.

Check out the widget gallery https://panel.holoviz.org/reference/index.html#widgets for inspiration.

How to use Panel widgets in 4 simple steps#

Define your function

>>> def my_func(value1, value2):
...    ...
...    return some_python_object

Define your widgets

>>> widget1 = pn.widgets.SomeWidget(value=..., ...).servable(area='sidebar')
>>> widget2 = pn.widgets.AnotherWidget(value=..., ...).servable(area='sidebar')

Bind the function to your widgets

>>> interactive_func = pn.bind(my_func, value1=widget1, value2=widget2)

Layout your interactive function in a panel, Column, Row or similar

>>> pn.panel(interactive_func).servable()

For more detail see the Getting Started Guide https://panel.holoviz.org/getting_started/index.html

class panel.widgets.ArrayInput(*, max_array_size, description, placeholder, serializer, type, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: LiteralInput

The ArrayInput allows rendering and editing NumPy arrays in a text input widget.

Arrays larger than the max_array_size will be summarized and editing will be disabled.

Reference: https://panel.holoviz.org/reference/widgets/ArrayInput.html

Example:

>>> To be determined ...

Parameter Definitions

Parameters inherited from:

max_array_size = Number(default=1000, inclusive_bounds=(True, True), label='Max array size'): Arrays larger than this limit will be allowed in Python but will not be serialized into JavaScript. Although such large arrays will thus not be editable in the widget, such a restriction helps avoid overwhelming the browser and lets other widgets remain usable.

class panel.widgets.AutocompleteInput(*, case_sensitive, description, min_characters, placeholder, restrict, search_strategy, value_input, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: SingleSelectBase

The AutocompleteInput widget allows selecting multiple values from a list of options.

It falls into the broad category of multi-value, option-selection widgets that provide a compatible API and include the MultiSelect, CrossSelector, CheckBoxGroup and CheckButtonGroup widgets.

The MultiChoice widget provides a much more compact UI than MultiSelect.

Reference: https://panel.holoviz.org/reference/widgets/AutocompleteInput.html

Example:

>>> AutocompleteInput(
...     name='Study', options=['Biology', 'Chemistry', 'Physics'],
...     placeholder='Write your study here ...'
... )

Parameter Definitions

Parameters inherited from:

value = Parameter(allow_None=True, default='', label='Value'): Initial or entered text value updated when <enter> key is pressed.
width = Integer(allow_None=True, bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Width'): Width of this component. If sizing_mode is set to stretch or scale mode this will merely be used as a suggestion.
case_sensitive = Boolean(default=True, label='Case sensitive'): Enable or disable case sensitivity.
min_characters = Integer(default=2, inclusive_bounds=(True, True), label='Min characters'): The number of characters a user must type before completions are presented.
placeholder = String(default='', label='Placeholder'): Placeholder for empty input field.
restrict = Boolean(default=True, label='Restrict'): Set to False in order to allow users to enter text that is not present in the list of completion strings.
search_strategy = Selector(default='starts_with', label='Search strategy', names={}, objects=['starts_with', 'includes']): Define how to search the list of completion strings. The default option “starts_with” means that the user’s text must match the start of a completion string. Using “includes” means that the user’s text can match any substring of a completion string.
value_input = String(allow_None=True, default='', label='Value input'): Initial or entered text value updated on every key press.
description = String(allow_None=True, label='Description'): An HTML string describing the function of this component.

class panel.widgets.BooleanStatus(*, color, throttle, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: BooleanIndicator

The BooleanStatus is a boolean indicator providing a visual representation of a boolean status as filled or non-filled circle.

If the value is set to True the indicator will be filled while setting it to False will cause it to be non-filled.

Reference: https://panel.holoviz.org/reference/indicators/BooleanStatus.html

Example:

>>> BooleanStatus(value=True, color='primary', width=100, height=100)

Parameter Definitions

Parameters inherited from:

value = Boolean(allow_refs=True, default=False, label='Value'): Whether the indicator is active or not.
height = Integer(allow_refs=True, bounds=(0, None), default=20, inclusive_bounds=(True, True), label='Height'): height of the circle.
width = Integer(allow_refs=True, bounds=(0, None), default=20, inclusive_bounds=(True, True), label='Width'): Width of the circle.
color = Selector(allow_refs=True, default='dark', label='Color', names={}, objects=['primary', 'secondary', 'success', 'info', 'danger', 'warning', 'light', 'dark']): The color of the circle, one of ‘primary’, ‘secondary’, ‘success’, ‘info’, ‘danger’, ‘warning’, ‘light’, ‘dark’

class panel.widgets.Button(*, clicks, button_style, button_type, icon, icon_size, description, description_delay, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _ButtonBase, _ClickButton, IconMixin, TooltipMixin

The Button widget allows triggering events when the button is clicked.

The Button provides a value parameter, which will toggle from False to True while the click event is being processed

It also provides an additional clicks parameter, that can be watched to subscribe to click events.

Reference: https://panel.holoviz.org/reference/widgets/Button.html#widgets-gallery-button

Example:

>>> pn.widgets.Button(name='Click me', icon='caret-right', button_type='primary')

Methods

`jslink`(target[, code, args, bidirectional])	Links properties on the this Button to those on the target object in Javascript (JS) code.
`on_click`(callback)	Register a callback to be executed when the Button is clicked.

Parameter Definitions

Parameters inherited from:

value = Event(allow_refs=True, default=False, label='Value'): Toggles from False to True while the event is being processed.
clicks = Integer(allow_refs=True, default=0, inclusive_bounds=(True, True), label='Clicks'): Number of clicks (can be listened to)

jslink(target: JSLinkTarget, code: dict[str, str] | None = None, args: dict[str, Any] | None = None, bidirectional: bool = False, **links: str) → Link[source]#

Links properties on the this Button to those on the target object in Javascript (JS) code.

Supports two modes, either specify a mapping between the source and target model properties as keywords or provide a dictionary of JS code snippets which maps from the source parameter to a JS code snippet which is executed when the property changes.

Parameters:

target: panel.viewable.Viewable | bokeh.model.Model | holoviews.core.dimension.Dimensioned: The target to link the value(s) to.
code: dict: Custom code which will be executed when the widget value changes.
args: dict: A mapping of objects to make available to the JS callback
bidirectional: boolean: Whether to link source and target bi-directionally. Default is False.
**links: dict[str,str]: A mapping between properties on the source model and the target model property to link it to.

Returns:

Link: The Link can be used unlink the widget and the target model.

on_click(callback: Callable[[Event], None | Awaitable[None]]) → Watcher[source]#

Register a callback to be executed when the Button is clicked.

The callback is given an Event argument declaring the number of clicks

Parameters:

callback:: The function to run on click events. Must accept a positional Event argument. Can be a sync or async function

Returns:

watcher: param.Parameterized.Watcher: A Watcher that executes the callback when the button is clicked.

class panel.widgets.ButtonIcon(*, clicks, toggle_duration, active_icon, icon, size, description, description_delay, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _ClickableIcon, _ClickButton, TooltipMixin

The ButtonIcon widget facilitates event triggering upon button clicks.

This widget displays a default icon initially. Upon being clicked, an active_icon appears for a specified toggle_duration.

For instance, the ButtonIcon can be effectively utilized to implement a feature akin to ChatGPT’s copy-to-clipboard button.

The button incorporates a value attribute, which alternates between False and True as the click event is processed.

Furthermore, it includes an clicks attribute, enabling subscription to click events for further actions or monitoring.

Reference: https://panel.holoviz.org/reference/widgets/ButtonIcon.html

Example:

>>> button_icon = pn.widgets.ButtonIcon(
...     icon='clipboard',
...     active_icon='check',
...     description='Copy',
...     toggle_duration=2000
... )

Methods

on_click(callback)

Register a callback to be executed when the button is clicked.

Parameter Definitions

Parameters inherited from:

value = Boolean(default=False, label='Value'): Toggles from False to True while the event is being processed.
clicks = Integer(default=0, inclusive_bounds=(True, True), label='Clicks'): The number of times the button has been clicked.
toggle_duration = Integer(default=75, inclusive_bounds=(True, True), label='Toggle duration'): The number of milliseconds the active_icon should be shown for and how long the button should be disabled for.

on_click(callback: Callable[[Event], None]) → Watcher[source]#

Register a callback to be executed when the button is clicked.

The callback is given an Event argument declaring the number of clicks.

Parameters:

callback: (Callable[[param.parameterized.Event], None]): The function to run on click events. Must accept a positional Event argument

Returns:

watcher: param.Parameterized.Watcher: A Watcher that executes the callback when the MenuButton is clicked.

class panel.widgets.CheckBoxGroup(*, inline, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _CheckGroupBase

The CheckBoxGroup widget allows selecting between a list of options by ticking the corresponding checkboxes.

It falls into the broad category of multi-option selection widgets that provide a compatible API and include the MultiSelect, CrossSelector and CheckButtonGroup widgets.

Reference: https://panel.holoviz.org/reference/widgets/CheckBoxGroup.html

Example:

>>> CheckBoxGroup(
...     name='Fruits', value=['Apple', 'Pear'], options=['Apple', 'Banana', 'Pear', 'Strawberry'],
...     inline=True
... )

Parameter Definitions

Parameters inherited from:

inline = Boolean(default=False, label='Inline'): Whether the items be arrange vertically (False) or horizontally in-line (True).

class panel.widgets.CheckButtonGroup(*, orientation, options, button_style, button_type, description, description_delay, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _CheckGroupBase, _ButtonBase, TooltipMixin

The CheckButtonGroup widget allows selecting between a list of options by toggling the corresponding buttons.

It falls into the broad category of multi-option selection widgets that provide a compatible API and include the MultiSelect, CrossSelector and CheckBoxGroup widgets.

Reference: https://panel.holoviz.org/reference/widgets/CheckButtonGroup.html

Example:

>>> CheckButtonGroup(
...     name='Regression Models', value=['Lasso', 'Ridge'],
...     options=['Lasso', 'Linear', 'Ridge', 'Polynomial']
... )

Parameter Definitions

Parameters inherited from:

orientation = Selector(default='horizontal', label='Orientation', names={}, objects=['horizontal', 'vertical']): Button group orientation, either ‘horizontal’ (default) or ‘vertical’.

class panel.widgets.Checkbox(**params: Any)[source]#

Bases: _BooleanWidget

The Checkbox allows toggling a single condition between True/False states by ticking a checkbox.

This widget is interchangeable with the Toggle widget.

Reference: https://panel.holoviz.org/reference/widgets/Checkbox.html

Example:

>>> Checkbox(name='Works with the tools you know and love', value=True)

Parameter Definitions

Parameters inherited from:

class panel.widgets.CodeEditor(*, annotations, filename, language, on_keyup, print_margin, readonly, theme, value_input, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: Widget

The CodeEditor widget allows displaying and editing code in the powerful Ace editor.

Reference: https://panel.holoviz.org/reference/widgets/CodeEditor.html

Example:

>>> CodeEditor(value=py_code, language='python', theme='monokai')

Parameter Definitions

Parameters inherited from:

value = String(default='', label='Value'): State of the current code in the editor if on_keyup. Otherwise, only upon loss of focus, i.e. clicking outside the editor, or pressing <Ctrl+Enter> or <Cmd+Enter>.
annotations = List(bounds=(0, None), default=[], label='Annotations'): List of annotations to add to the editor.
filename = String(default='', label='Filename'): Filename from which to deduce language
language = String(default='text', label='Language'): Language of the editor
on_keyup = Boolean(default=True, label='On keyup'): Whether to update the value on every key press or only upon loss of focus / hotkeys.
print_margin = Boolean(default=False, label='Print margin'): Whether to show the a print margin.
readonly = Boolean(default=False, label='Readonly'): Define if editor content can be modified. Alias for disabled.
theme = Selector(default='chrome', label='Theme', names={}, objects=['ambiance', 'chaos', 'chrome', 'clouds', 'clouds_midnight', 'cobalt', 'crimson_editor', 'dawn', 'dracula', 'dreamweaver', 'eclipse', 'github', 'gob', 'gruvbox', 'idle_fingers', 'iplastic', 'katzenmilch', 'kr_theme', 'kuroir', 'merbivore', 'merbivore_soft', 'mono_industrial', 'monokai', 'pastel_on_dark', 'solarized_dark', 'solarized_light', 'sqlserver', 'terminal', 'textmate', 'tomorrow', 'tomorrow_night', 'tomorrow_night_blue', 'tomorrow_night_bright', 'tomorrow_night_eighties', 'twilight', 'vibrant_ink', 'xcode']): If no value is provided, it defaults to the current theme set by pn.config.theme, as specified in the CodeEditor.THEME_CONFIGURATION dictionary. If not defined there, it falls back to the default parameter value.
value_input = String(default='', label='Value input'): State of the current code updated on every key press. Identical to value if on_keyup.

class panel.widgets.ColorPicker(**params: Any)[source]#

Bases: Widget

The ColorPicker widget allows selecting a hexadecimal RGB color value using the browser’s color-picking widget.

Reference: https://panel.holoviz.org/reference/widgets/ColorPicker.html

Example:

>>> ColorPicker(name='Color', value='#99ef78')

Parameter Definitions

Parameters inherited from:

value = Color(allow_None=True, allow_named=True, label='Value'): The selected color
width = Integer(allow_None=True, bounds=(0, None), default=52, inclusive_bounds=(True, True), label='Width'): Width of this component. If sizing_mode is set to stretch or scale mode this will merely be used as a suggestion.
description = String(allow_None=True, label='Description'): An HTML string describing the function of this component.

class panel.widgets.CompositeWidget(*, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: Widget

A baseclass for widgets which are made up of two or more other widgets

Methods

select([selector])

Iterates over the Viewable and any potential children in the applying the Selector.

Parameter Definitions

Parameters inherited from:

select(selector: type | Callable[[Viewable], bool] | None = None) → list[Viewable][source]#

Iterates over the Viewable and any potential children in the applying the Selector.

Parameters:

selector: type or callable or None: The selector allows selecting a subset of Viewables by declaring a type or callable function to filter by.

Returns:

viewables: list(Viewable)

class panel.widgets.CrossSelector(*, definition_order, filter_fn, size, description, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: CompositeWidget, MultiSelect

A composite widget which allows selecting from a list of items by moving them between two lists. Supports filtering values by name to select them in bulk.

Reference: https://panel.holoviz.org/reference/widgets/CrossSelector.html

Example:

>>> CrossSelector(
...     name='Fruits', value=['Apple', 'Pear'],
...     options=['Apple', 'Banana', 'Pear', 'Strawberry']
... )

Parameter Definitions

Parameters inherited from:

height = Integer(allow_None=True, bounds=(0, None), default=200, inclusive_bounds=(True, True), label='Height'): The number of options shown at once (note this is the only way to control the height of this widget)
width = Integer(allow_None=True, bounds=(0, None), default=600, inclusive_bounds=(True, True), label='Width'): The number of options shown at once (note this is the only way to control the height of this widget)
size = Integer(default=10, inclusive_bounds=(True, True), label='Size'): The number of options shown at once (note this is the only way to control the height of this widget)
filter_fn = Callable(label='Filter fn'): The filter function applied when querying using the text fields, defaults to re.search. Function is two arguments, the query or pattern and the item label.
definition_order = Integer(default=True, inclusive_bounds=(True, True), label='Definition order'): Whether to preserve definition order after filtering. Disable to allow the order of selection to define the order of the selected list.

filter_fn(string, flags=0)[source]#: Scan through string looking for a match to the pattern, returning a Match object, or None if no match was found.

class panel.widgets.DataFrame(value=None, **params)[source]#

Bases: BaseTable

The DataFrame widget allows displaying and editing a pandas DataFrame.

Note that editing is not possible for multi-indexed DataFrames, in which case you will need to reduce the DataFrame to a single index.

Also note that the DataFrame widget will eventually be replaced with the Tabulator widget, and so new code should be written to use Tabulator instead.

Reference: https://panel.holoviz.org/reference/widgets/DataFrame.html

Example:

>>> DataFrame(df, name='DataFrame')

Parameter Definitions

Parameters inherited from:

auto_edit = Boolean(default=False, label='Auto edit'): Whether clicking on a table cell automatically starts edit mode.
autosize_mode = Selector(default='force_fit', label='Autosize mode', names={}, objects=['none', 'fit_columns', 'fit_viewport', 'force_fit']): Determines the column autosizing mode, as one of the following options: "fit_columns" Compute column widths based on cell contents while ensuring the table fits into the available viewport. This results in no horizontal scrollbar showing up, but data can get unreadable if there is not enough space available. "fit_viewport" Adjust the viewport size after computing column widths based on cell contents. "force_fit" Fit columns into available space dividing the table width across the columns equally (equivalent to fit_columns=True). This results in no horizontal scrollbar showing up, but data can get unreadable if there is not enough space available. "none" Do not automatically compute column widths.
fit_columns = Boolean(allow_None=True, label='Fit columns'): Whether columns should expand to the available width. This results in no horizontal scrollbar showing up, but data can get unreadable if there is no enough space available.
frozen_columns = Integer(allow_None=True, inclusive_bounds=(True, True), label='Frozen columns'): Integer indicating the number of columns to freeze. If set, the first N columns will be frozen, which prevents them from scrolling out of frame.
frozen_rows = Integer(allow_None=True, inclusive_bounds=(True, True), label='Frozen rows'): Integer indicating the number of rows to freeze. If set, the first N rows will be frozen, which prevents them from scrolling out of frame; if set to a negative value the last N rows will be frozen.
reorderable = Boolean(default=True, label='Reorderable'): Allows the reordering of a table’s columns. To reorder a column, click and drag a table’s header to the desired location in the table. The columns on either side will remain in their previous order.
sortable = Boolean(default=True, label='Sortable'): Allows to sort table’s contents. By default natural order is preserved. To sort a column, click on its header. Clicking one more time changes sort direction. Use Ctrl + click to return to natural order. Use Shift + click to sort multiple columns simultaneously.

class panel.widgets.DatePicker(*, description, disabled_dates, enabled_dates, end, start, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: Widget

The DatePicker allows selecting a date value using a text box and a date-picking utility.

Reference: https://panel.holoviz.org/reference/widgets/DatePicker.html

Example:

>>> DatePicker(
...     value=date(2025,1,1),
...     start=date(2025,1,1), end=date(2025,12,31),
...     name='Date'
... )

Parameter Definitions

Parameters inherited from:

value = CalendarDate(allow_None=True, inclusive_bounds=(True, True), label='Value'): The current value
width = Integer(allow_None=True, bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Width'): Width of this component. If sizing_mode is set to stretch or scale mode this will merely be used as a suggestion.
start = CalendarDate(allow_None=True, inclusive_bounds=(True, True), label='Start'): Inclusive lower bound of the allowed date selection
end = CalendarDate(allow_None=True, inclusive_bounds=(True, True), label='End'): Inclusive upper bound of the allowed date selection

disabled_dates = List(allow_None=True, bounds=(0, None), class_=(<class 'datetime.date'>, <class 'str'>), item_type=(<class 'datetime.date'>, <class 'str'>), label='Disabled dates')

enabled_dates = List(allow_None=True, bounds=(0, None), class_=(<class 'datetime.date'>, <class 'str'>), item_type=(<class 'datetime.date'>, <class 'str'>), label='Enabled dates')

description = String(allow_None=True, label='Description'): An HTML string describing the function of this component.

class panel.widgets.DateRangePicker(*, description, disabled_dates, enabled_dates, end, start, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: Widget

The DateRangePicker allows selecting a date range using a text box and a date-picking utility.

Reference: https://panel.holoviz.org/reference/widgets/DateRangePicker.html

Example:

>>> DateRangePicker(
...     value=(date(2025,1,1), date(2025,1,5)),
...     start=date(2025,1,1), end=date(2025,12,31),
...     name='Date range'
... )

Parameter Definitions

Parameters inherited from:

value = DateRange(allow_None=True, inclusive_bounds=(True, True), label='Value', length=2): The current value
width = Integer(allow_None=True, bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Width'): Width of this component. If sizing_mode is set to stretch or scale mode this will merely be used as a suggestion.
start = CalendarDate(allow_None=True, inclusive_bounds=(True, True), label='Start'): Inclusive lower bound of the allowed date selection
end = CalendarDate(allow_None=True, inclusive_bounds=(True, True), label='End'): Inclusive upper bound of the allowed date selection

disabled_dates = List(allow_None=True, bounds=(0, None), class_=(<class 'datetime.date'>, <class 'str'>), item_type=(<class 'datetime.date'>, <class 'str'>), label='Disabled dates')

enabled_dates = List(allow_None=True, bounds=(0, None), class_=(<class 'datetime.date'>, <class 'str'>), item_type=(<class 'datetime.date'>, <class 'str'>), label='Enabled dates')

description = String(allow_None=True, label='Description'): An HTML string describing the function of this component.

class panel.widgets.DateRangeSlider(*, end, format, start, step, value_throttled, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _SliderBase

The DateRangeSlider widget allows selecting a date range using a slider with two handles. Supports datetime.datetime, datetime.date and np.datetime64 ranges.

Reference: https://panel.holoviz.org/reference/widgets/DateRangeSlider.html

Example:

>>> import datetime as dt
>>> DateRangeSlider(
...     value=(dt.datetime(2025, 1, 9), dt.datetime(2025, 1, 16)),
...     start=dt.datetime(2025, 1, 1),
...     end=dt.datetime(2025, 1, 31),
...     step=2,
...     name="A tuple of datetimes"
... )

Parameter Definitions

Parameters inherited from:

value = DateRange(allow_None=True, inclusive_bounds=(True, True), label='Value', length=2): The selected range as a tuple of values. Updated when one of the handles is dragged. Supports datetime.datetime, datetime.date, and np.datetime64 ranges.
value_start = Date(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value start', readonly=True): The lower value of the selected range.
value_end = Date(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value end', readonly=True): The upper value of the selected range.
value_throttled = DateRange(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value throttled', length=2, nested_refs=True): The selected range as a tuple of values. Updated one of the handles is released. Supports datetime.datetime, datetime.date and np.datetime64 ranges
start = Date(allow_None=True, inclusive_bounds=(True, True), label='Start'): The lower bound.
end = Date(allow_None=True, inclusive_bounds=(True, True), label='End'): The upper bound.
step = Number(default=1, inclusive_bounds=(True, True), label='Step'): The step size in days. Default is 1 day.
format = String(allow_None=True, label='Format'): Datetime format used for parsing and formatting the date.

class panel.widgets.DateSlider(*, as_datetime, end, format, start, step, value_throttled, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _SliderBase

The DateSlider widget allows selecting a value within a set of bounds using a slider. Supports datetime.datetime, datetime.date and np.datetime64 values. The step size is fixed at 1 day.

Reference: https://panel.holoviz.org/reference/widgets/DateSlider.html

Example:

>>> import datetime as dt
>>> DateSlider(
...     value=dt.datetime(2025, 1, 1),
...     start=dt.datetime(2025, 1, 1),
...     end=dt.datetime(2025, 1, 7),
...     name="A datetime value"
... )

Parameter Definitions

Parameters inherited from:

value = Date(allow_None=True, inclusive_bounds=(True, True), label='Value'): The selected date value of the slider. Updated when the slider handle is dragged. Supports datetime.datetime, datetime.date or np.datetime64 types.
value_throttled = Date(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value throttled'): The value of the slider. Updated when the slider handle is released.
start = Date(allow_None=True, inclusive_bounds=(True, True), label='Start'): The lower bound.
end = Date(allow_None=True, inclusive_bounds=(True, True), label='End'): The upper bound.
as_datetime = Boolean(default=False, label='As datetime'): Whether to store the date as a datetime.
step = Integer(bounds=(1, None), default=1, inclusive_bounds=(True, True), label='Step'): The step parameter in days.
format = String(allow_None=True, label='Format'): Datetime format used for parsing and formatting the date.

class panel.widgets.DatetimeInput(*, end, format, start, description, placeholder, serializer, type, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: LiteralInput

The DatetimeInput allows specifying Python datetime like values using a text input widget.

An optional type may be declared.

Reference: https://panel.holoviz.org/reference/widgets/DatetimeInput.html

Example:

>>> DatetimeInput(name='Datetime', value=datetime(2019, 2, 8))

Parameter Definitions

Parameters inherited from:

value = Date(allow_None=True, inclusive_bounds=(True, True), label='Value'): The current value
start = Date(allow_None=True, inclusive_bounds=(True, True), label='Start'): Inclusive lower bound of the allowed date selection
end = Date(allow_None=True, inclusive_bounds=(True, True), label='End'): Inclusive upper bound of the allowed date selection
format = String(default='%Y-%m-%d %H:%M:%S', label='Format'): Datetime format used for parsing and formatting the datetime.

type[source]#: alias of datetime

class panel.widgets.DatetimePicker(*, mode, as_numpy_datetime64, description, disabled_dates, enable_seconds, enable_time, enabled_dates, end, military_time, start, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _DatetimePickerBase

The DatetimePicker allows selecting selecting a datetime value using a textbox and a datetime-picking utility.

Reference: https://panel.holoviz.org/reference/widgets/DatetimePicker.html

Example:

>>> DatetimePicker(
...    value=datetime(2025,1,1,22,0),
...    start=date(2025,1,1), end=date(2025,12,31),
...    military_time=True, name='Date and time'
... )

Parameter Definitions

Parameters inherited from:

value = Date(allow_None=True, inclusive_bounds=(True, True), label='Value'): The widget value which the widget type resolves to when used as a reactive param reference.

mode = String(constant=True, default='single', label='Mode')

class panel.widgets.DatetimeRangeInput(*, end, format, start, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: CompositeWidget

The DatetimeRangeInput widget allows selecting a datetime range using two DatetimeInput widgets, which return a tuple range.

Reference: https://panel.holoviz.org/reference/widgets/DatetimeRangeInput.html

Example:

>>> DatetimeRangeInput(
...     name='Datetime Range',
...     value=(datetime(2017, 1, 1), datetime(2018, 1, 10)),
...     start=datetime(2017, 1, 1), end=datetime(2019, 1, 1),
... )

Parameter Definitions

Parameters inherited from:

value = Tuple(default=(None, None), label='Value', length=2): The current value
start = Date(allow_None=True, inclusive_bounds=(True, True), label='Start'): Inclusive lower bound of the allowed date selection
end = Date(allow_None=True, inclusive_bounds=(True, True), label='End'): Inclusive upper bound of the allowed date selection
format = String(default='%Y-%m-%d %H:%M:%S', label='Format'): Datetime format used for parsing and formatting the datetime.

class panel.widgets.DatetimeRangePicker(*, mode, as_numpy_datetime64, description, disabled_dates, enable_seconds, enable_time, enabled_dates, end, military_time, start, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _DatetimePickerBase

The DatetimeRangePicker allows selecting selecting a datetime range using a text box and a datetime-range-picking utility.

Reference: https://panel.holoviz.org/reference/widgets/DatetimeRangePicker.html

Example:

>>> DatetimeRangePicker(
...    value=(datetime(2025,1,1,22,0), datetime(2025,1,2,22,0)),
...    start=date(2025,1,1), end=date(2025,12,31),
...    military_time=True, name='Datetime Range'
... )

Parameter Definitions

Parameters inherited from:

value = DateRange(allow_None=True, inclusive_bounds=(True, True), label='Value', length=2): The current value

mode = String(constant=True, default='range', label='Mode')

class panel.widgets.DatetimeRangeSlider(*, end, format, start, step, value_throttled, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: DateRangeSlider

The DatetimeRangeSlider widget allows selecting a datetime range using a slider with two handles. Supports datetime.datetime and np.datetime64 ranges.

Reference: https://panel.holoviz.org/reference/widgets/DatetimeRangeSlider.html

Example:

>>> import datetime as dt
>>> DatetimeRangeSlider(
...     value=(dt.datetime(2025, 1, 9), dt.datetime(2025, 1, 16)),
...     start=dt.datetime(2025, 1, 1),
...     end=dt.datetime(2025, 1, 31),
...     step=10000,
...     name="A tuple of datetimes"
... )

Parameter Definitions

Parameters inherited from:

step = Number(default=60000, inclusive_bounds=(True, True), label='Step'): The step size in ms. Default is 1 min.

class panel.widgets.DatetimeSlider(*, as_datetime, end, format, start, step, value_throttled, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: DateSlider

The DatetimeSlider widget allows selecting a value within a set of bounds using a slider. Supports datetime.date, datetime.datetime and np.datetime64 values. The step size is fixed at 1 minute.

Reference: https://panel.holoviz.org/reference/widgets/DatetimeSlider.html

Example:

>>> import datetime as dt
>>> DatetimeSlider(
...     value=dt.datetime(2025, 1, 1),
...     start=dt.datetime(2025, 1, 1),
...     end=dt.datetime(2025, 1, 7),
...     name="A datetime value"
... )

Parameter Definitions

Parameters inherited from:

as_datetime = Boolean(constant=True, default=True, label='As datetime', readonly=True): Whether to store the date as a datetime.
step = Number(bounds=(1, None), default=60, inclusive_bounds=(True, True), label='Step'): The step size in seconds. Default is 1 minute, i.e 60 seconds.

class panel.widgets.Debugger(*, _number_of_errors, _number_of_infos, _number_of_warnings, formatter_args, level, logger_names, only_last, active_header_background, button_css_classes, collapsed, collapsible, header, header_background, header_color, header_css_classes, hide_header, title, title_css_classes, auto_scroll_limit, scroll_button_threshold, scroll_position, view_latest, scroll, objects, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, name)[source]#

Bases: Card

A uneditable Card layout holding a terminal printing out logs from your callbacks. By default, it will only print exceptions. If you want to add your own log, use the panel.callbacks logger within your callbacks: logger = logging.getLogger(‘panel.callbacks’)

Methods

acknowledge_errors
update_log_counts

Parameter Definitions

Parameters inherited from:

_number_of_errors = Integer(bounds=(0, None), default=0, inclusive_bounds=(True, True), label=' number of errors'): Number of logged errors since last acknowledged.
_number_of_warnings = Integer(bounds=(0, None), default=0, inclusive_bounds=(True, True), label=' number of warnings'): Number of logged warnings since last acknowledged.
_number_of_infos = Integer(bounds=(0, None), default=0, inclusive_bounds=(True, True), label=' number of infos'): Number of logged information since last acknowledged.
only_last = Boolean(default=True, label='Only last'): Whether only the last stack is printed or the full.
level = Integer(default=40, inclusive_bounds=(True, True), label='Level'): Logging level to print in the debugger terminal.
formatter_args = Dict(class_=<class 'dict'>, default={'fmt': '%(asctime)s [%(name)s - %(levelname)s]: %(message)s'}, label='Formatter args'): Arguments to pass to the logging formatter. See the standard python logging libraries.
logger_names = List(bounds=(1, None), class_=<class 'str'>, default=['panel'], item_type=<class 'str'>, label='Logger names'): Loggers which will be prompted in the debugger terminal.

class panel.widgets.Dial(*, annulus_width, background, bounds, colors, default_color, end_angle, format, label_color, nan_format, needle_color, needle_width, start_angle, tick_size, title_size, unfilled_color, value_size, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: ValueIndicator

A Dial represents a value in some range as a position on an annular dial. It is similar to a Gauge but more minimal visually.

Reference: https://panel.holoviz.org/reference/indicators/Dial.html

Example:

>>> Dial(name='Speed', value=79, format="{value} km/h", bounds=(0, 200), colors=[(0.4, 'green'), (1, 'red')])

Parameter Definitions

Parameters inherited from:

value = Number(allow_None=True, default=25, inclusive_bounds=(True, True), label='Value'): Value to indicate on the dial a value within the declared bounds.
height = Integer(bounds=(1, None), default=250, inclusive_bounds=(True, True), label='Height'): The height of the component (in pixels). This can be either fixed or preferred height, depending on height sizing policy.
width = Integer(bounds=(1, None), default=250, inclusive_bounds=(True, True), label='Width'): The width of the component (in pixels). This can be either fixed or preferred width, depending on width sizing policy.
annulus_width = Number(default=0.2, inclusive_bounds=(True, True), label='Annulus width'): Width of the radial annulus as a fraction of the total.
background = Parameter(allow_None=True, label='Background'): Background color of the component.
bounds = Range(default=(0, 100), inclusive_bounds=(True, True), label='Bounds', length=2): The upper and lower bound of the dial.
colors = List(allow_None=True, bounds=(0, None), label='Colors'): Color thresholds for the Dial, specified as a list of tuples of the fractional threshold and the color to switch to.
default_color = String(default='lightblue', label='Default color'): Color of the radial annulus if not color thresholds are supplied.
end_angle = Number(default=25, inclusive_bounds=(True, True), label='End angle'): Angle at which the dial ends.
format = String(default='{value}%', label='Format'): Formatting string for the value indicator and lower/upper bounds.
label_color = String(default='black', label='Label color'): Color for all extraneous labels.
nan_format = String(default='-', label='Nan format'): How to format nan values.
needle_color = String(default='black', label='Needle color'): Color of the Dial needle.
needle_width = Number(default=0.1, inclusive_bounds=(True, True), label='Needle width'): Radial width of the needle.
start_angle = Number(default=-205, inclusive_bounds=(True, True), label='Start angle'): Angle at which the dial starts.
tick_size = String(allow_None=True, label='Tick size'): Font size of the Dial min/max labels.
title_size = String(allow_None=True, label='Title size'): Font size of the Dial title.
unfilled_color = String(default='whitesmoke', label='Unfilled color'): Color of the unfilled region of the Dial.
value_size = String(allow_None=True, label='Value size'): Font size of the Dial value label.

class panel.widgets.DiscretePlayer(*, value_throttled, direction, interval, loop_policy, preview_duration, scale_buttons, show_loop_controls, show_value, step, value_align, visible_buttons, visible_loop_options, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: PlayerBase, SelectBase

The DiscretePlayer provides controls to iterate through a list of discrete options. The speed at which the widget plays is defined by the interval (in milliseconds), but it is also possible to skip items using the step parameter.

Reference: https://panel.holoviz.org/reference/widgets/DiscretePlayer.html

Example:

>>> DiscretePlayer(
...     name='Discrete Player',
...     options=[2, 4, 8, 16, 32, 64, 128], value=32,
...     loop_policy='loop',
...     value_align='start'
... )

Parameter Definitions

Parameters inherited from:

value = Parameter(allow_None=True, label='Value'): Current player value
interval = Integer(default=500, inclusive_bounds=(True, True), label='Interval'): Interval between updates
show_value = Boolean(default=True, label='Show value'): Whether to show the widget value
value_throttled = Parameter(allow_None=True, constant=True, label='Value throttled'): Current player value

class panel.widgets.DiscreteSlider(*, formatter, options, value_throttled, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: CompositeWidget, _SliderBase

The DiscreteSlider widget allows selecting a value from a discrete list or dictionary of values using a slider.

Reference: https://panel.holoviz.org/reference/widgets/DiscreteSlider.html

Example:

>>> DiscreteSlider(
...     value=0,
...     options=list([0, 1, 2, 4, 8, 16, 32, 64]),
...     name="A discrete value",
... )

Attributes:

labels: The list of labels to display
values: The list of option values

Parameter Definitions

Parameters inherited from:

value = Parameter(allow_None=True, label='Value'): The selected value of the slider. Updated when the handle is dragged. Must be one of the options.
value_throttled = Parameter(allow_None=True, constant=True, label='Value throttled'): The value of the slider. Updated when the handle is released.
options = ClassSelector(class_=(<class 'dict'>, <class 'list'>), default=[], label='Options'): A list or dictionary of valid options.
formatter = String(default='%.3g', label='Formatter'): A custom format string. Separate from format parameter since formatting is applied in Python, not via the bokeh TickFormatter.

property labels#: The list of labels to display

property values#: The list of option values

class panel.widgets.EditableFloatSlider(*, fixed_end, fixed_start, editable, end, start, step, value_throttled, format, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _EditableContinuousSlider, FloatSlider

The EditableFloatSlider widget allows selecting selecting a numeric floating-point value within a set of bounds using a slider and for more precise control offers an editable number input box.

Reference: https://panel.holoviz.org/reference/widgets/EditableFloatSlider.html

Example:

>>> EditableFloatSlider(
...     value=1.0, start=0.0, end=2.0, step=0.25, name="A float value"
... )

Parameter Definitions

Parameters inherited from:

fixed_start = Number(allow_None=True, inclusive_bounds=(True, True), label='Fixed start'): A fixed lower bound for the slider and input.
fixed_end = Number(allow_None=True, inclusive_bounds=(True, True), label='Fixed end'): A fixed upper bound for the slider and input.

class panel.widgets.EditableIntSlider(*, fixed_end, fixed_start, editable, end, start, step, value_throttled, format, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _EditableContinuousSlider, IntSlider

The EditableIntSlider widget allows selecting selecting an integer value within a set of bounds using a slider and for more precise control offers an editable integer input box.

Reference: https://panel.holoviz.org/reference/widgets/EditableIntSlider.html

Example:

>>> EditableIntSlider(
...     value=2, start=0, end=5, step=1, name="An integer value"
... )

Parameter Definitions

Parameters inherited from:

fixed_start = Integer(allow_None=True, inclusive_bounds=(True, True), label='Fixed start'): A fixed lower bound for the slider and input.
fixed_end = Integer(allow_None=True, inclusive_bounds=(True, True), label='Fixed end'): A fixed upper bound for the slider and input.

class panel.widgets.EditableRangeSlider(*, editable, end, fixed_end, fixed_start, format, start, step, value_throttled, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: CompositeWidget, _SliderBase

The EditableRangeSlider widget allows selecting a floating-point range using a slider with two handles and for more precise control also offers a set of number input boxes.

Reference: https://panel.holoviz.org/reference/widgets/EditableRangeSlider.html

Example:

>>> EditableRangeSlider(
...      value=(1.0, 1.5), start=0.0, end=2.0, step=0.25, name="A tuple of floats"
... )

Parameter Definitions

Parameters inherited from:

value = Range(default=(0, 1), inclusive_bounds=(True, True), label='Value', length=2): Current range value. Updated when a handle is dragged.
show_value = Boolean(constant=True, default=False, label='Show value', readonly=True): Whether to show the widget value.
value_throttled = Range(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value throttled', length=2): The value of the slider. Updated when the handle is released.
start = Number(default=0.0, inclusive_bounds=(True, True), label='Start'): Lower bound of the range.
end = Number(default=1.0, inclusive_bounds=(True, True), label='End'): Upper bound of the range.
fixed_start = Number(allow_None=True, inclusive_bounds=(True, True), label='Fixed start'): A fixed lower bound for the slider and input.
fixed_end = Number(allow_None=True, inclusive_bounds=(True, True), label='Fixed end'): A fixed upper bound for the slider and input.
step = Number(default=0.1, inclusive_bounds=(True, True), label='Step'): Slider and number input step.
editable = Tuple(default=(True, True), label='Editable', length=2): Whether the lower and upper values are editable.
format = ClassSelector(class_=(<class 'str'>, <class 'bokeh.models.formatters.TickFormatter'>), default='0.0[0000]', label='Format'): Allows defining a custom format string or bokeh TickFormatter.

class panel.widgets.FileDownload(file=None, **params)[source]#

Bases: IconMixin

The FileDownload widget allows a user to download a file.

It works either by sending the file data to the browser on initialization (`embed`=True), or when the button is clicked.

Reference: https://panel.holoviz.org/reference/widgets/FileDownload.html

Example:

>>> FileDownload(file='IntroductionToPanel.ipynb', filename='intro.ipynb')

Parameter Definitions

Parameters inherited from:

auto = Boolean(default=True, label='Auto'): Whether to download on the initial click or allow for right-click save as.
button_type = Selector(default='default', label='Button type', names={}, objects=['default', 'primary', 'success', 'warning', 'danger', 'light']): A button theme; should be one of ‘default’ (white), ‘primary’ (blue), ‘success’ (green), ‘info’ (yellow), ‘light’ (light), or ‘danger’ (red).
button_style = Selector(default='solid', label='Button style', names={}, objects=['solid', 'outline']): A button style to switch between ‘solid’, ‘outline’.
callback = Callable(allow_None=True, label='Callback'): A callable that returns the file path or file-like object.
data = String(allow_None=True, label='Data'): The data being transferred.
embed = Boolean(default=False, label='Embed'): Whether to embed the file on initialization.
file = Parameter(allow_None=True, label='File'): The file, Path, file-like object or file contents to transfer. If the file is not pointing to a file on disk a filename must also be provided.
filename = String(allow_None=True, label='Filename'): A filename which will also be the default name when downloading the file.
label = String(default='Download file', label='Label'): The label of the download button
description = String(allow_None=True, label='Description'): An HTML string describing the function of this component.

_clicks = Integer(default=0, inclusive_bounds=(True, True), label=' clicks')

_transfers = Integer(default=0, inclusive_bounds=(True, True), label=' transfers')

class panel.widgets.FileDropper(*, accepted_filetypes, chunk_size, layout, max_file_size, max_files, max_total_file_size, mime_type, multiple, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: Widget

The FileDropper allows the user to upload one or more files to the server.

It is similar to the FileInput widget but additionally adds support for chunked uploads, making it possible to upload large files. The UI also supports previews for image files. Unlike FileInput the uploaded files are stored as dictionary of bytes object indexed by the filename.

Reference: https://panel.holoviz.org/reference/widgets/FileDropper.html

Example:

>>> FileDropper(accepted_filetypes=['image/*'], multiple=True)

Parameter Definitions

Parameters inherited from:

value = Dict(class_=<class 'dict'>, default={}, label='Value'): A dictionary containing the uploaded file(s) as bytes or string objects indexed by the filename. Files that have a text/* mimetype will automatically be decoded as utf-8.
width = Integer(allow_None=True, bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Width'): Width of this component. If sizing_mode is set to stretch or scale mode this will merely be used as a suggestion.
accepted_filetypes = List(bounds=(0, None), default=[], label='Accepted filetypes'): List of accepted file types. Can be mime types, file extensions or wild cards.For instance [‘image/*’] will accept all images. [‘.png’, ‘image/jpeg’] will only accepts PNGs and JPEGs.
chunk_size = Integer(default=10000000, inclusive_bounds=(True, True), label='Chunk size'): Size in bytes per chunk transferred across the WebSocket.
layout = Selector(label='Layout', names={}, objects=['circle', 'compact', 'integrated']): Compact mode will remove padding, integrated mode is used to render FilePond as part of a bigger element. Circle mode adjusts the item position offsets so buttons and progress indicators don’t fall outside of the circular shape.
max_file_size = String(allow_None=True, label='Max file size'): Maximum size of a file as a string with units given in KB or MB, e.g. 5MB or 750KB.
max_files = Integer(allow_None=True, inclusive_bounds=(True, True), label='Max files'): Maximum number of files that can be uploaded if multiple=True.
max_total_file_size = String(allow_None=True, label='Max total file size'): Maximum size of all uploaded files, as a string with units given in KB or MB, e.g. 5MB or 750KB.
mime_type = Dict(class_=<class 'dict'>, default={}, label='Mime type'): A dictionary containing the mimetypes for each of the uploaded files indexed by their filename.
multiple = Boolean(default=False, label='Multiple'): Whether to allow uploading multiple files.

class panel.widgets.FileInput(**params: Any)[source]#

Bases: Widget

The FileInput allows the user to upload one or more files to the server.

It makes the filename, MIME type and (bytes) content available in Python.

Please note

you can in fact drag and drop files onto the FileInput.
you easily save the files using the save method.

Reference: https://panel.holoviz.org/reference/widgets/FileInput.html

Example:

>>> FileInput(accept='.png,.jpeg', multiple=True)

Methods

`clear`()	Clear the file(s) in the FileInput widget
`save`(filename)	Saves the uploaded FileInput data object(s) to file(s) or BytesIO object(s).

Parameter Definitions

Parameters inherited from:

value = Parameter(allow_None=True, label='Value'): The uploaded file(s) stored as a single bytes object if multiple is False or a list of bytes otherwise.
accept = String(allow_None=True, label='Accept'): A comma separated string of all extension types that should be supported.
description = String(allow_None=True, label='Description'): An HTML string describing the function of this component rendered as a tooltip icon.
directory = Boolean(default=False, label='Directory'): Whether to allow selection of directories instead of files. The filename will be relative paths to the uploaded directory. .. note:: When a directory is uploaded it will give add a confirmation pop up. The confirmation pop up cannot be disabled, as this is a security feature in the browser. .. note:: The accept parameter only works with file extension. When using accept with directory, the number of files reported will be the total amount of files, not the filtered.
filename = ClassSelector(allow_None=True, class_=(<class 'str'>, <class 'list'>), label='Filename'): Name of the uploaded file(s).
mime_type = ClassSelector(allow_None=True, class_=(<class 'str'>, <class 'list'>), label='Mime type'): Mimetype of the uploaded file(s).
multiple = Boolean(default=False, label='Multiple'): Whether to allow uploading multiple files. If enabled value parameter will return a list.

clear()[source]#: Clear the file(s) in the FileInput widget

save(filename)[source]#

Saves the uploaded FileInput data object(s) to file(s) or BytesIO object(s).

Parameters:

filename (str or list[str]): File path or file-like object

class panel.widgets.FileSelector(directory: AnyStr | os.PathLike | None = None, fs: AbstractFileSystem | None = None, **params)[source]#

Bases: BaseFileNavigator

The FileSelector widget allows browsing the filesystem on the server and selecting one or more files in a directory.

Reference: https://panel.holoviz.org/reference/widgets/FileSelector.html

Example:

>>> FileSelector(directory='~', file_pattern='*.png')

Parameter Definitions

Parameters inherited from:

show_hidden = Boolean(default=False, label='Show hidden'): Whether to show hidden files and directories (starting with a period).
size = Integer(default=10, inclusive_bounds=(True, True), label='Size'): The number of options shown at once (note this is the only way to control the height of this widget)

class panel.widgets.FloatInput(*, step, value_throttled, page_step_multiplier, wheel_wait, mode, description, end, format, placeholder, start, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _SpinnerBase, _FloatInputBase

The FloatInput allows selecting a floating point value using a spinbox.

It behaves like a slider except that the lower and upper bounds are optional and a specific value can be entered. The value can be changed using the keyboard (up, down, page up, page down), mouse wheel and arrow buttons.

Reference: https://panel.holoviz.org/reference/widgets/FloatInput.html

Example:

>>> FloatInput(name='Value', value=5., step=1e-1, start=0, end=10)

Parameter Definitions

Parameters inherited from:

placeholder = String(default='', label='Placeholder'): Placeholder when the value is empty.
step = Number(default=0.1, inclusive_bounds=(True, True), label='Step'): The step size.
value_throttled = Number(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value throttled'): The current value. Updates only on <enter> or when the widget looses focus.

class panel.widgets.FloatSlider(*, end, start, step, value_throttled, format, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: ContinuousSlider

The FloatSlider widget allows selecting a floating-point value within a set of bounds using a slider.

Reference: https://panel.holoviz.org/reference/widgets/FloatSlider.html

Example:

>>> FloatSlider(value=0.5, start=0.0, end=1.0, step=0.1, name="Float value")

Parameter Definitions

Parameters inherited from:

value = Number(allow_None=True, default=0.0, inclusive_bounds=(True, True), label='Value'): The selected floating-point value of the slider. Updated when the handle is dragged.
start = Number(default=0.0, inclusive_bounds=(True, True), label='Start'): The lower bound.
end = Number(default=1.0, inclusive_bounds=(True, True), label='End'): The upper bound.
step = Number(default=0.1, inclusive_bounds=(True, True), label='Step'): The step size.
value_throttled = Number(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value throttled'): The value of the slider. Updated when the handle is released.

class panel.widgets.Gauge(*, annulus_width, bounds, colors, custom_opts, end_angle, format, num_splits, show_labels, show_ticks, start_angle, title_size, tooltip_format, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: ValueIndicator

A Gauge represents a value in some range as a position on speedometer or gauge. It is similar to a Dial but visually a lot busier.

Reference: https://panel.holoviz.org/reference/indicators/Gauge.html

Example:

>>> Gauge(name='Speed', value=79, bounds=(0, 200), colors=[(0.4, 'green'), (1, 'red')])

Parameter Definitions

Parameters inherited from:

value = Number(default=25, inclusive_bounds=(True, True), label='Value'): Value to indicate on the gauge a value within the declared bounds.
height = Integer(bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Height'): The height of the component (in pixels). This can be either fixed or preferred height, depending on height sizing policy.
width = Integer(bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Width'): The width of the component (in pixels). This can be either fixed or preferred width, depending on width sizing policy.
annulus_width = Integer(default=10, inclusive_bounds=(True, True), label='Annulus width'): Width of the gauge annulus.
bounds = Range(default=(0, 100), inclusive_bounds=(True, True), label='Bounds', length=2): The upper and lower bound of the dial.
colors = List(allow_None=True, bounds=(0, None), label='Colors'): Color thresholds for the Gauge, specified as a list of tuples of the fractional threshold and the color to switch to.
custom_opts = Dict(allow_None=True, class_=<class 'dict'>, label='Custom opts'): Additional options to pass to the ECharts Gauge definition.
end_angle = Number(default=-45, inclusive_bounds=(True, True), label='End angle'): Angle at which the gauge ends.
format = String(default='{value}%', label='Format'): Formatting string for the value indicator.
num_splits = Integer(default=10, inclusive_bounds=(True, True), label='Num splits'): Number of splits along the gauge.
show_ticks = Boolean(default=True, label='Show ticks'): Whether to show ticks along the dials.
show_labels = Boolean(default=True, label='Show labels'): Whether to show tick labels along the dials.
start_angle = Number(default=225, inclusive_bounds=(True, True), label='Start angle'): Angle at which the gauge starts.
tooltip_format = String(default='{b} : {c}%', label='Tooltip format'): Formatting string for the hover tooltip.
title_size = Integer(default=18, inclusive_bounds=(True, True), label='Title size'): Size of title font.

class panel.widgets.Grammar(*, src, uri, weight, name)[source]#

Bases: Parameterized

A set of words or patterns of words that we want the speech recognition service to recognize

For example

grammar = Grammar(: src=’#JSGF V1.0; grammar colors; public <color> = aqua | azure | beige;’, weight=0.7

)

Wraps the HTML SpeechGrammar API. See https://developer.mozilla.org/en-US/docs/Web/API/SpeechGrammar

Methods

serialize()

Returns the grammar as dict

Parameter Definitions

src = String(default='', label='Src'): A set of words or patterns of words that we want the recognition service to recognize. Defined using JSpeech Grammar Format. See https://www.w3.org/TR/jsgf/.
uri = String(default='', label='Uri'): An uri pointing to the definition. If src is available it will be used. Otherwise uri. The uri will be loaded on the client side only.
weight = Number(bounds=(0.0, 1.0), default=1, inclusive_bounds=(True, True), label='Weight', step=0.01): The weight of the grammar. A number in the range 0–1. Default is 1.

serialize()[source]#: Returns the grammar as dict

class panel.widgets.GrammarList(iterable=(), /)[source]#

Bases: list

A list of Grammar objects containing words or patterns of words that we want the recognition service to recognize.

Example:

grammar = ‘#JSGF V1.0; grammar colors; public <color> = aqua | azure | beige | bisque ;’ grammar_list = GrammarList() grammar_list.add_from_string(grammar, 1)

Wraps the HTML 5 SpeechGrammarList API

See https://developer.mozilla.org/en-US/docs/Web/API/SpeechGrammarList

Methods

serialize()

Returns a list of serialized grammars

add_from_string(src, weight=1.0)[source]#: Takes a src and weight and adds it to the GrammarList as a new Grammar object. The new Grammar object is returned.

add_from_uri(uri, weight=1.0)[source]#: Takes a grammar present at a specific uri, and adds it to the GrammarList as a new Grammar object. The new Grammar object is returned.

serialize()[source]#: Returns a list of serialized grammars

class panel.widgets.IntInput(*, step, value_throttled, page_step_multiplier, wheel_wait, mode, description, end, format, placeholder, start, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _SpinnerBase, _IntInputBase

The IntInput allows selecting an integer value using a spinbox.

It behaves like a slider except that lower and upper bounds are optional and a specific value can be entered. The value can be changed using the keyboard (up, down, page up, page down), mouse wheel and arrow buttons.

Reference: https://panel.holoviz.org/reference/widgets/IntInput.html

Example:

>>> IntInput(name='Value', value=100, start=0, end=1000, step=10)

Parameter Definitions

Parameters inherited from:

step = Integer(default=1, inclusive_bounds=(True, True), label='Step'): The step size.
value_throttled = Integer(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value throttled'): The current value. Updates only on <enter> or when the widget looses focus.

class panel.widgets.IntRangeSlider(*, end, format, start, step, value_throttled, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: RangeSlider

The IntRangeSlider widget allows selecting an integer range using a slider with two handles.

Reference: https://panel.holoviz.org/reference/widgets/IntRangeSlider.html

Example:

>>> IntRangeSlider(
...     value=(2, 4), start=0, end=10, step=2, name="A tuple of integers"
... )

Parameter Definitions

Parameters inherited from:

start = Integer(default=0, inclusive_bounds=(True, True), label='Start'): The lower bound.
end = Integer(default=1, inclusive_bounds=(True, True), label='End'): The upper bound.
step = Integer(default=1, inclusive_bounds=(True, True), label='Step'): The step size

class panel.widgets.IntSlider(*, end, start, step, value_throttled, format, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: ContinuousSlider

The IntSlider widget allows selecting an integer value within a set of bounds using a slider.

Reference: https://panel.holoviz.org/reference/widgets/IntSlider.html

Example:

>>> IntSlider(value=5, start=0, end=10, step=1, name="Integer Value")

Parameter Definitions

Parameters inherited from:

value = Integer(allow_None=True, default=0, inclusive_bounds=(True, True), label='Value'): The selected integer value of the slider. Updated when the handle is dragged.
start = Integer(default=0, inclusive_bounds=(True, True), label='Start'): The lower bound.
end = Integer(default=1, inclusive_bounds=(True, True), label='End'): The upper bound.
step = Integer(default=1, inclusive_bounds=(True, True), label='Step'): The step size.
value_throttled = Integer(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value throttled'): The value of the slider. Updated when the handle is released

class panel.widgets.JSONEditor(**params: Any)[source]#

Bases: Widget

The JSONEditor provides a visual editor for JSON-serializable datastructures, e.g. Python dictionaries and lists, with functionality for different editing modes, inserting objects and validation using JSON Schema.

Reference: https://panel.holoviz.org/reference/widgets/JSONEditor.html

Example:

>>> JSONEditor(value={
...     'dict'  : {'key': 'value'},
...     'float' : 3.14,
...     'int'   : 1,
...     'list'  : [1, 2, 3],
...     'string': 'A string',
... }, mode='code')

Parameter Definitions

Parameters inherited from:

value = Parameter(default={}, label='Value'): JSON data to be edited.
menu = Boolean(default=True, label='Menu'): Adds main menu bar - Contains format, sort, transform, search etc. functionality. true by default. Applicable in all types of mode.
mode = Selector(default='tree', label='Mode', names={}, objects=['tree', 'view', 'form', 'text', 'preview']): Sets the editor mode. In ‘view’ mode, the data and datastructure is read-only. In ‘form’ mode, only the value can be changed, the data structure is read-only. Mode ‘code’ requires the Ace editor to be loaded on the page. Mode ‘text’ shows the data as plain text. The ‘preview’ mode can handle large JSON documents up to 500 MiB. It shows a preview of the data, and allows to transform, sort, filter, format, or compact the data.
search = Boolean(default=True, label='Search'): Enables a search box in the upper right corner of the JSONEditor. true by default. Only applicable when mode is ‘tree’, ‘view’, or ‘form’.
selection = List(bounds=(0, None), default=[], label='Selection'): Current selection.
schema = Dict(allow_None=True, class_=<class 'dict'>, label='Schema'): Validate the JSON object against a JSON schema. A JSON schema describes the structure that a JSON object must have, like required properties or the type that a value must have. See http://json-schema.org/ for more information.
templates = List(bounds=(0, None), default=[], label='Templates'): Array of templates that will appear in the context menu, Each template is a json object precreated that can be added as a object value to any node in your document.

class panel.widgets.LinearGauge(*, bounds, colors, default_color, format, horizontal, nan_format, needle_color, show_boundaries, tick_size, title_size, unfilled_color, value_size, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: ValueIndicator

A LinearGauge represents a value in some range as a position on an linear scale. It is similar to a Dial/Gauge but visually more compact.

Reference: https://panel.holoviz.org/reference/indicators/LinearGauge.html

Example:

>>> LinearGauge(value=30, default_color='red', bounds=(0, 100))

Parameter Definitions

Parameters inherited from:

value = Number(allow_None=True, default=25, inclusive_bounds=(True, True), label='Value'): Value to indicate on the dial a value within the declared bounds.
height = Integer(bounds=(1, None), default=300, inclusive_bounds=(True, True), label='Height'): The height of the component (in pixels). This can be either fixed or preferred height, depending on height sizing policy.
width = Integer(bounds=(1, None), default=125, inclusive_bounds=(True, True), label='Width'): The width of the component (in pixels). This can be either fixed or preferred width, depending on width sizing policy.
bounds = Range(default=(0, 100), inclusive_bounds=(True, True), label='Bounds', length=2): The upper and lower bound of the gauge.
default_color = String(default='lightblue', label='Default color'): Color of the radial annulus if not color thresholds are supplied.
colors = Parameter(allow_None=True, label='Colors'): Color thresholds for the gauge, specified as a list of tuples of the fractional threshold and the color to switch to.
format = String(default='{value:.2f}%', label='Format'): Formatting string for the value indicator and lower/upper bounds.
horizontal = Boolean(default=False, label='Horizontal'): Whether to display the linear gauge horizontally.
nan_format = String(default='-', label='Nan format'): How to format nan values.
needle_color = String(default='black', label='Needle color'): Color of the gauge needle.
show_boundaries = Boolean(default=False, label='Show boundaries'): Whether to show the boundaries between colored regions.
unfilled_color = String(default='whitesmoke', label='Unfilled color'): Color of the unfilled region of the LinearGauge.
title_size = String(allow_None=True, label='Title size'): Font size of the gauge title.
tick_size = String(allow_None=True, label='Tick size'): Font size of the gauge tick labels.
value_size = String(allow_None=True, label='Value size'): Font size of the gauge value label.

class panel.widgets.LiteralInput(*, description, placeholder, serializer, type, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: Widget

The LiteralInput allows declaring Python literals using a text input widget.

A literal is some specific primitive value of type str , int, float, bool etc or a dict, list, tuple, set etc of primitive values.

Optionally the literal type may be declared.

Reference: https://panel.holoviz.org/reference/widgets/LiteralInput.html

Example:

>>> LiteralInput(name='Dictionary', value={'key': [1, 2, 3]}, type=dict)

Parameter Definitions

Parameters inherited from:

value = Parameter(allow_None=True, label='Value'): The widget value which the widget type resolves to when used as a reactive param reference.
width = Integer(allow_None=True, bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Width'): Width of this component. If sizing_mode is set to stretch or scale mode this will merely be used as a suggestion.
description = String(allow_None=True, label='Description'): An HTML string describing the function of this component.
placeholder = String(default='', label='Placeholder'): Placeholder for empty input field.
serializer = Selector(default='ast', label='Serializer', names={}, objects=['ast', 'json']): The serialization (and deserialization) method to use. ‘ast’ uses ast.literal_eval and ‘json’ uses json.loads and json.dumps.

type = ClassSelector(allow_None=True, class_=(<class 'type'>, <class 'tuple'>), label='Type')

class panel.widgets.LoadingSpinner(*, bgcolor, color, size, throttle, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: BooleanIndicator

The LoadingSpinner is a boolean indicator providing a visual representation of the loading status.

If the value is set to True the spinner will rotate while setting it to False will disable the rotating segment.

Reference: https://panel.holoviz.org/reference/indicators/LoadingSpinner.html

Example:

>>> LoadingSpinner(value=True, color='primary', bgcolor='light', width=100, height=100)

Parameter Definitions

Parameters inherited from:

value = Boolean(allow_refs=True, default=False, label='Value'): Whether the indicator is active or not.

bgcolor = Selector(allow_refs=True, default='light', label='Bgcolor', names={}, objects=['dark', 'light'])

color = Selector(allow_refs=True, default='dark', label='Color', names={}, objects=['primary', 'secondary', 'success', 'info', 'danger', 'warning', 'light', 'dark'])

size = Integer(allow_refs=True, default=125, inclusive_bounds=(True, True), label='Size'): Size of the spinner in pixels.

class panel.widgets.MenuButton(*, clicked, items, split, button_style, button_type, icon, icon_size, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _ButtonBase, _ClickButton, IconMixin

The MenuButton widget allows specifying a list of menu items to select from triggering events when the button is clicked.

Unlike other widgets, it does not have a value parameter. Instead it has a clicked parameter that can be watched to trigger events and which reports the last clicked menu item.

Reference: https://panel.holoviz.org/reference/widgets/MenuButton.html

Example:

>>> menu_items = [('Option A', 'a'), ('Option B', 'b'), None, ('Option C', 'c')]
>>> MenuButton(name='Dropdown', items=menu_items, button_type='primary')

Methods

on_click(callback)

Register a callback to be executed when the button is clicked.

Parameter Definitions

Parameters inherited from:

clicked = String(allow_None=True, label='Clicked'): Last menu item that was clicked.
items = List(bounds=(0, None), default=[], label='Items'): Menu items in the dropdown. Allows strings, tuples of the form (title, value) or Nones to separate groups of items.
split = Boolean(default=False, label='Split'): Whether to add separate dropdown area to button.

on_click(callback: Callable[[Event], None]) → Watcher[source]#

Register a callback to be executed when the button is clicked.

The callback is given an Event argument declaring the number of clicks

Parameters:

callback: (Callable[[param.parameterized.Event], None]): The function to run on click events. Must accept a positional Event argument

Returns:

watcher: param.Parameterized.Watcher: A Watcher that executes the callback when the MenuButton is clicked.

class panel.widgets.MultiChoice(*, delete_button, max_items, option_limit, placeholder, search_option_limit, solid, description, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _MultiSelectBase

The MultiChoice widget allows selecting multiple values from a list of options.

It falls into the broad category of multi-value, option-selection widgets that provide a compatible API and include the MultiSelect, CrossSelector, CheckBoxGroup and CheckButtonGroup widgets.

The MultiChoice widget provides a much more compact UI than MultiSelect.

Reference: https://panel.holoviz.org/reference/widgets/MultiChoice.html

Example:

>>> MultiChoice(
...     name='Favourites', value=['Panel', 'hvPlot'],
...     options=['Panel', 'hvPlot', 'HoloViews', 'GeoViews', 'Datashader', 'Param', 'Colorcet'],
...     max_items=2
... )

Parameter Definitions

Parameters inherited from:

width = Integer(allow_None=True, bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Width'): Width of this component. If sizing_mode is set to stretch or scale mode this will merely be used as a suggestion.
delete_button = Boolean(default=True, label='Delete button'): Whether to display a button to delete a selected option.
max_items = Integer(allow_None=True, bounds=(1, None), inclusive_bounds=(True, True), label='Max items'): Maximum number of options that can be selected.
option_limit = Integer(allow_None=True, bounds=(1, None), inclusive_bounds=(True, True), label='Option limit'): Maximum number of options to display at once.
search_option_limit = Integer(allow_None=True, bounds=(1, None), inclusive_bounds=(True, True), label='Search option limit'): Maximum number of options to display at once if search string is entered.
placeholder = String(default='', label='Placeholder'): String displayed when no selection has been made.
solid = Boolean(default=True, label='Solid'): Whether to display widget with solid or light style.

class panel.widgets.MultiSelect(*, size, description, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _MultiSelectBase

The MultiSelect widget allows selecting multiple values from a list of options.

It falls into the broad category of multi-value, option-selection widgets that provide a compatible API and include the`CrossSelector`, CheckBoxGroup and CheckButtonGroup widgets.

Reference: https://panel.holoviz.org/reference/widgets/MultiSelect.html

Example:

>>> MultiSelect(
...     name='Frameworks', value=['Bokeh', 'Panel'],
...     options=['Bokeh', 'Dash', 'Panel', 'Streamlit', 'Voila'], size=8
... )

Methods

on_double_click(callback)

Register a callback to be executed when a MultiSelect option is double-clicked.

Parameter Definitions

Parameters inherited from:

size = Integer(allow_refs=True, default=4, inclusive_bounds=(True, True), label='Size'): The number of items displayed at once (i.e. determines the widget height).

on_double_click(callback: Callable[[Event], None | Awaitable[None]]) → Watcher[source]#

Register a callback to be executed when a MultiSelect option is double-clicked.

The callback is given an DoubleClickEvent argument

Parameters:

callback:: The function to run on click events. Must accept a positional Event argument. Can be a sync or async function

class panel.widgets.NestedSelect(*, _levels, _max_depth, _widgets, layout, levels, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: CompositeWidget

The NestedSelect widget is composed of multiple widgets, where subsequent select options depend on the parent’s value.

Reference: https://panel.holoviz.org/reference/widgets/NestedSelect.html

Example:

>>> NestedSelect(
...     options={
...         "gfs": {"tmp": [1000, 500], "pcp": [1000]},
...         "name": {"tmp": [1000, 925, 850, 700, 500], "pcp": [1000]},
...     },
...     levels=["model", "var", "level"],
... )

Parameter Definitions

Parameters inherited from:

value = Dict(allow_None=True, class_=<class 'dict'>, label='Value'): The value from all the Select widgets; the keys are the levels names. If no levels names are specified, the keys are the levels indices.
disabled = Boolean(default=False, label='Disabled'): Whether the widget is disabled.
layout = Parameter(default=<class 'panel.layout.base.Column'>, label='Layout'): The layout type of the widgets. If a dictionary, a “type” key can be provided, to specify the layout type of the widgets, and any additional keyword arguments will be used to instantiate the layout.
levels = List(bounds=(0, None), default=[], label='Levels'): Either a list of strings or a list of dictionaries. If a list of strings, the strings are used as the names of the levels. If a list of dictionaries, each dictionary may have a “name” key, which is used as the name of the level, a “type” key, which is used as the type of widget, and any corresponding widget keyword arguments. Must be specified if options is callable.
options = ClassSelector(allow_None=True, class_=(<class 'list'>, <class 'dict'>, <class 'function'>), label='Options'): The options to select from. The options may be nested dictionaries, lists, or callables that return those types. If callables are used, the callables must accept level and value keyword arguments, where level is the level that updated and value is a dictionary of the current values, containing keys up to the level that was updated.
_widgets = List(bounds=(0, None), default=[], label=' widgets'): The nested select widgets.
_max_depth = Integer(default=0, inclusive_bounds=(True, True), label=' max depth'): The number of levels of the nested select widgets.
_levels = List(bounds=(0, None), default=[], label=' levels'): The internal rep of levels to prevent overwriting user provided levels.

layout[source]#: alias of Column

class panel.widgets.Number(*, colors, default_color, font_size, format, nan_format, title_size, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: ValueIndicator

The Number indicator renders the value as text optionally colored according to the colors thresholds.

Reference: https://panel.holoviz.org/reference/indicators/Number.html

Example:

>>> Number(name='Rate', value=72, format='{value}%', colors=[(80, 'green'), (100, 'red')]

Parameter Definitions

Parameters inherited from:

default_color = String(default='black', label='Default color'): The color of the Number indicator if no colors are provided
colors = List(allow_None=True, bounds=(0, None), label='Colors'): Color thresholds for the Number indicator, specified as a tuple of the absolute thresholds and the color to switch to.
format = String(default='{value}', label='Format'): A formatter string which accepts a {value}.
font_size = String(default='54pt', label='Font size'): The size of number itself.
nan_format = String(default='-', label='Nan format'): How to format nan values.
title_size = String(default='18pt', label='Title size'): The size of the title given by the name.

class panel.widgets.NumberInput(*, page_step_multiplier, wheel_wait, description, end, format, placeholder, start, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _SpinnerBase

Parameter Definitions

Parameters inherited from:

class panel.widgets.PasswordInput(**params: Any)[source]#

Bases: _TextInputBase

The PasswordInput allows entering any string using an obfuscated text input box.

Reference: https://panel.holoviz.org/reference/widgets/PasswordInput.html

Example:

>>> PasswordInput(
...     name='Password', placeholder='Enter your password here...'
... )

Parameter Definitions

Parameters inherited from:

class panel.widgets.Player(*, end, start, value_throttled, direction, interval, loop_policy, preview_duration, scale_buttons, show_loop_controls, show_value, step, value_align, visible_buttons, visible_loop_options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: PlayerBase

The Player provides controls to play and skip through a number of frames defined by explicit start and end values. The speed at which the widget plays is defined by the interval (in milliseconds), but it is also possible to skip frames using the step parameter.

Reference: https://panel.holoviz.org/reference/widgets/Player.html

Example:

>>> Player(name='Player', start=0, end=100, value=32, loop_policy='loop', value_align='top_center')

Parameter Definitions

Parameters inherited from:

value = Integer(default=0, inclusive_bounds=(True, True), label='Value'): Current player value
start = Integer(default=0, inclusive_bounds=(True, True), label='Start'): Lower bound on the slider value
end = Integer(default=10, inclusive_bounds=(True, True), label='End'): Upper bound on the slider value
value_throttled = Integer(constant=True, default=0, inclusive_bounds=(True, True), label='Value throttled'): Current throttled player value.

class panel.widgets.Progress(*, active, bar_color, max, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: ValueIndicator

The Progress widget displays the progress towards some target based on the current value and the max value.

If no value is set, the Progress widget is in indeterminate mode and will animate depending on whether it is active or not. A more beautiful indicator for this use case is the LoadingSpinner.

Reference: https://panel.holoviz.org/reference/indicators/Progress.html

Example:

>>> Progress(value=20, max=100, bar_color="primary")

Parameter Definitions

Parameters inherited from:

value = Integer(bounds=(-1, None), default=-1, inclusive_bounds=(True, True), label='Value'): The current value of the progress bar. If set to -1 the progress bar will be indeterminate and animate depending on the active parameter.
width = Integer(bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Width'): The width of the component (in pixels). This can be either fixed or preferred width, depending on width sizing policy.
sizing_mode = Selector(label='Sizing mode', names={}, objects=['fixed', 'stretch_width', 'stretch_height', 'stretch_both', 'scale_width', 'scale_height', 'scale_both', None]): How the component should size itself. This is a high-level setting for maintaining width and height of the component. To gain more fine grained control over sizing, use width_policy, height_policy and aspect_ratio instead (those take precedence over sizing_mode). "fixed" Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events. "stretch_width" Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents. "stretch_height" Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents. "stretch_both" Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component. "scale_width" Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio. "scale_height" Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio. "scale_both" Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.
active = Boolean(default=True, label='Active'): If no value is set the active property toggles animation of the progress bar on and off.

bar_color = Selector(default='success', label='Bar color', names={}, objects=['primary', 'secondary', 'success', 'info', 'danger', 'warning', 'light', 'dark'])

max = Integer(default=100, inclusive_bounds=(True, True), label='Max'): The maximum value of the progress bar.

sizing_mode = None#

class panel.widgets.RadioBoxGroup(*, inline, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _RadioGroupBase

The RadioBoxGroup widget allows selecting from a list or dictionary of values using a set of checkboxes.

It falls into the broad category of single-value, option-selection widgets that provide a compatible API and include the RadioButtonGroup, Select and DiscreteSlider widgets.

Reference: https://panel.holoviz.org/reference/widgets/RadioBoxGroup.html

Example:

>>> RadioBoxGroup(
...     name='Sponsor', options=['Anaconda', 'Blackstone'], inline=True
... )

Parameter Definitions

Parameters inherited from:

inline = Boolean(default=False, label='Inline'): Whether the items be arrange vertically (False) or horizontally in-line (True).

class panel.widgets.RadioButtonGroup(*, orientation, options, button_style, button_type, description, description_delay, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _RadioGroupBase, _ButtonBase, TooltipMixin

The RadioButtonGroup widget allows selecting from a list or dictionary of values using a set of toggle buttons.

It falls into the broad category of single-value, option-selection widgets that provide a compatible API and include the RadioBoxGroup, Select, and DiscreteSlider widgets.

Reference: https://panel.holoviz.org/reference/widgets/RadioButtonGroup.html

Example:

>>> RadioButtonGroup(
...     name='Plotting library', options=['Matplotlib', 'Bokeh', 'Plotly'],
...     button_type='success'
... )

Parameter Definitions

Parameters inherited from:

orientation = Selector(default='horizontal', label='Orientation', names={}, objects=['horizontal', 'vertical']): Button group orientation, either ‘horizontal’ (default) or ‘vertical’.

class panel.widgets.RangeSlider(*, end, format, start, step, value_throttled, bar_color, direction, orientation, show_value, tooltips, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _RangeSliderBase

The RangeSlider widget allows selecting a floating-point range using a slider with two handles.

Reference: https://panel.holoviz.org/reference/widgets/RangeSlider.html

Example:

>>> RangeSlider(
...     value=(1.0, 1.5), start=0.0, end=2.0, step=0.25, name="A tuple of floats"
... )

Parameter Definitions

Parameters inherited from:

value = Range(default=(0, 1), inclusive_bounds=(True, True), label='Value', length=2, nested_refs=True): The selected range as a tuple of values. Updated when a handle is dragged.
value_start = Number(constant=True, default=0, inclusive_bounds=(True, True), label='Value start', readonly=True): The lower value of the selected range.
value_end = Number(constant=True, default=1, inclusive_bounds=(True, True), label='Value end', readonly=True): The upper value of the selected range.
value_throttled = Range(allow_None=True, constant=True, inclusive_bounds=(True, True), label='Value throttled', length=2, nested_refs=True): The selected range as a tuple of floating point values. Updated when a handle is released
start = Number(default=0, inclusive_bounds=(True, True), label='Start'): The lower bound.
end = Number(default=1, inclusive_bounds=(True, True), label='End'): The upper bound.
step = Number(default=0.1, inclusive_bounds=(True, True), label='Step'): The step size.
format = ClassSelector(allow_None=True, class_=(<class 'str'>, <class 'bokeh.models.formatters.TickFormatter'>), label='Format'): A format string or bokeh TickFormatter.

class panel.widgets.Select(*, description, disabled_options, groups, size, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: SingleSelectBase

The Select widget allows selecting a value from a list or dictionary of options by selecting it from a dropdown menu or selection area.

It falls into the broad category of single-value, option-selection widgets that provide a compatible API and include the RadioBoxGroup, AutocompleteInput and DiscreteSlider widgets.

Reference: https://panel.holoviz.org/reference/widgets/Select.html

Example:

>>> Select(name='Study', options=['Biology', 'Chemistry', 'Physics'])

Attributes:

labels
values

Parameter Definitions

Parameters inherited from:

width = Integer(allow_None=True, bounds=(0, None), default=300, inclusive_bounds=(True, True), label='Width'): Width of this component. If sizing_mode is set to stretch or scale mode this will merely be used as a suggestion.
description = String(allow_None=True, label='Description'): An HTML string describing the function of this component.
disabled_options = List(bounds=(0, None), default=[], label='Disabled options', nested_refs=True): Optional list of options that are disabled, i.e. unusable and un-clickable. If options is a dictionary the list items must be dictionary values.
groups = Dict(allow_None=True, class_=<class 'dict'>, label='Groups', nested_refs=True): Dictionary whose keys are used to visually group the options and whose values are either a list or a dictionary of options to select from. Mutually exclusive with options and valid only if size is 1.
size = Integer(bounds=(1, None), default=1, inclusive_bounds=(True, True), label='Size'): Declares how many options are displayed at the same time. If set to 1 displays options as dropdown otherwise displays scrollable area.

class panel.widgets.SpeechToText(*, _grammars, abort, audio_started, button_hide, button_not_started, button_started, button_type, continuous, grammars, interim_results, lang, max_alternatives, results, service_uri, sound_started, speech_started, start, started, stop, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: Widget

The SpeechToText widget controls the speech recognition service of the browser.

It wraps the HTML5 SpeechRecognition API. See https://developer.mozilla.org/en-US/docs/Web/API/SpeechRecognition

Reference: https://panel.holoviz.org/reference/widgets/SpeechToText.html

Example:

>>> SpeechToText(button_type="light")

This functionality is experimental and only supported by Chrome and a few other browsers. Checkout https://caniuse.com/speech-recognition for a up to date list of browsers supporting the SpeechRecognition Api. Or alternatively https://developer.mozilla.org/en-US/docs/Web/API/SpeechRecognition#Browser_compatibility

On some browsers, like Chrome, using Speech Recognition on a web page involves a server-based recognition engine. Your audio is sent to a web service for recognition processing, so it won’t work offline. Whether this is secure and confidential enough for your use case is up to you to evaluate.

Attributes:

results_as_html: Returns the results formatted as html
results_deserialized: Returns the results as a List of RecognitionResults

Parameter Definitions

Parameters inherited from:

value = String(constant=True, default=''): The transcipt of the highest confidence RecognitionAlternative of the last RecognitionResult. Please note we strip the transcript for leading spaces.
abort = Event(default=False, label='Abort'): Stops the speech recognition service from listening to incoming audio, and doesn’t attempt to return a RecognitionResult.
start = Event(default=False, label='Start'): Starts the speech recognition service listening to incoming audio with intent to recognize grammars associated with the current SpeechRecognition.
stop = Event(default=False, label='Stop'): Stops the speech recognition service from listening to incoming audio, and attempts to return a RecognitionResult using the audio captured so far.
lang = Selector(allow_None=True, default='', names={}, objects=['', 'af-ZA', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-IL', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-LB', 'ar-MA', 'ar-OM', 'ar-PS', 'ar-QA', 'ar-SA', 'ar-TN', 'bg-BG', 'ca-ES', 'cmn-Hans-CN', 'cmn-Hans-HK', 'cmn-Hant-TW', 'cs-CZ', 'da-DK', 'de-DE', 'el-GR', 'en-AU', 'en-CA', 'en-GB', 'en-IE', 'en-IN', 'en-NZ', 'en-PH', 'en-US', 'en-ZA', 'es-AR', 'es-BO', 'es-CL', 'es-CO', 'es-CR', 'es-DO', 'es-EC', 'es-ES', 'es-GT', 'es-HN', 'es-MX', 'es-NI', 'es-PA', 'es-PE', 'es-PR', 'es-PY', 'es-SV', 'es-US', 'es-UY', 'es-VE', 'eu-ES', 'fa-IR', 'fi-FI', 'fil-PH', 'fr-FR', 'gl-ES', 'he-IL', 'hi-IN', 'hr_HR', 'hu-HU', 'id-ID', 'is-IS', 'it-CH', 'it-IT', 'ja-JP', 'ko-KR', 'lt-LT', 'ms-MY', 'nb-NO', 'nl-NL', 'pl-PL', 'pt-BR', 'pt-PT', 'ro-RO', 'ru-RU', 'sk-SK', 'sl-SI', 'sr-RS', 'sv-SE', 'th-TH', 'tr-TR', 'uk-UA', 'vi-VN', 'yue-Hant-HK', 'zu-ZA']): The language of the current SpeechRecognition in BCP 47 format. For example ‘en-US’. If not specified, this defaults to the HTML lang attribute value, or the user agent’s language setting if that isn’t set either.
continuous = Boolean(default=False, label='Continuous'): Controls whether continuous results are returned for each recognition, or only a single result. Defaults to False
interim_results = Boolean(default=False, label='Interim results'): Controls whether interim results should be returned (True) or not (False.) Interim results are results that are not yet final (e.g. the RecognitionResult.is_final property is False).
max_alternatives = Integer(bounds=(1, 5), default=1, inclusive_bounds=(True, True), label='Max alternatives'): Sets the maximum number of RecognitionAlternatives provided per result. A number between 1 and 5. The default value is 1.
service_uri = String(default='', label='Service uri'): Specifies the location of the speech recognition service used by the current SpeechRecognition to handle the actual recognition. The default is the user agent’s default speech service.
grammars = ClassSelector(allow_None=True, class_=<class 'panel.widgets.speech_to_text.GrammarList'>, label='Grammars'): A GrammarList object that represents the grammars that will be understood by the current SpeechRecognition service
button_hide = Boolean(default=False): If True no button is shown. If False a toggle Start/ Stop button is shown.
button_type = Selector(default='light', label='Button type', names={}, objects=['default', 'primary', 'success', 'warning', 'danger', 'light', 'light', 'dark']): The button styling.
button_not_started = String(default=''): The text to show on the button when the SpeechRecognition service is NOT started. If ‘’ a muted microphone icon is shown.
button_started = String(default=''): The text to show on the button when the SpeechRecognition service is started. If ‘’ a muted microphone icon is shown.
started = Boolean(constant=True, default=False, label='Started'): Returns True if the Speech Recognition Service is started and False otherwise.
audio_started = Boolean(constant=True, default=False, label='Audio started'): Returns True if the Audio is started and False otherwise.
sound_started = Boolean(constant=True, default=False, label='Sound started'): Returns True if the Sound is started and False otherwise.
speech_started = Boolean(constant=True, default=False, label='Speech started'): Returns True if the the User has started speaking and False otherwise.
results = List(bounds=(0, None), constant=True, default=[], label='Results'): The results as a list of Dictionaries.
_grammars = List(bounds=(0, None), constant=True, default=[], label=' grammars'): List used to transfer the serialized grammars from server to browser.

property results_as_html: str#

Returns the results formatted as html

Convenience method for ease of use

property results_deserialized#: Returns the results as a List of RecognitionResults

panel.widgets.Spinner[source]#: alias of NumberInput

class panel.widgets.StaticText(**params: Any)[source]#

Bases: Widget

The StaticText widget displays a text value, but does not allow editing it.

Reference: https://panel.holoviz.org/reference/widgets/StaticText.html

Example:

>>> StaticText(name='Model', value='animagen2')

Parameter Definitions

Parameters inherited from:

value = Parameter(allow_None=True, label='Value'): The current value to be displayed.

class panel.widgets.Switch(**params: Any)[source]#

Bases: _BooleanWidget

The Switch allows toggling a single condition between True/False states by ticking a checkbox.

This widget is interchangeable with the Toggle widget.

Reference: https://panel.holoviz.org/reference/widgets/Switch.html

Example:

>>> Switch(name='Works with the tools you know and love', value=True)

Parameter Definitions

Parameters inherited from:

class panel.widgets.Tabulator(value=None, **params)[source]#

Bases: BaseTable

The Tabulator widget wraps the [Tabulator js](http://tabulator.info/) table to provide a full-featured, very powerful interactive table.

Reference: https://panel.holoviz.org/reference/widgets/Tabulator.html

Example:

>>> Tabulator(df, theme='site', pagination='remote', page_size=25)

Attributes:

current_view: Returns the current view of the table after filtering and sorting are applied.

Methods

`download`([filename])	Triggers downloading of the table as a CSV or JSON.
`download_menu`([text_kwargs, button_kwargs])	Returns a menu containing a TextInput and Button widget to set the filename and trigger a client-side download of the data.
`on_click`(callback[, column])	Register a callback to be executed when any cell is clicked.
`on_edit`(callback)	Register a callback to be executed when a cell is edited.
`stream`(stream_value[, rollover, ...])	Streams (appends) the stream_value provided to the existing value in an efficient manner.

Parameter Definitions

Parameters inherited from:

selection = _ListValidateWithCallable(allow_refs=True, bounds=(0, None), default=[], item_type=<class 'int'>, label='Selection'): The currently selected rows of the table. It validates its values against ‘selectable_rows’ if used.
row_height = Integer(allow_refs=True, default=30, inclusive_bounds=(True, True), label='Row height'): The height of each table row.
buttons = Dict(allow_refs=True, class_=<class 'dict'>, default={}, label='Buttons', nested_refs=True): Dictionary mapping from column name to a HTML element to use as the button icon.
expanded = List(allow_refs=True, bounds=(0, None), default=[], label='Expanded', nested_refs=True): List of expanded rows, only applicable if a row_content function has been defined.
embed_content = Boolean(allow_refs=True, default=False, label='Embed content'): Whether to embed the row_content or render it dynamically when a row is expanded.
filters = List(allow_refs=True, bounds=(0, None), default=[], label='Filters'): List of client-side filters declared as dictionaries containing ‘field’, ‘type’ and ‘value’ keys.
frozen_columns = ClassSelector(allow_refs=True, class_=(<class 'list'>, <class 'dict'>), default=[], label='Frozen columns', nested_refs=True): One of: - List indicating the columns to freeze. The column(s) may be selected by name or index. - Dict indicating columns to freeze as keys and their freeze location as values, freeze location is either ‘right’ or ‘left’.
frozen_rows = List(allow_refs=True, bounds=(0, None), default=[], label='Frozen rows', nested_refs=True): List indicating the rows to freeze. If set, the first N rows will be frozen, which prevents them from scrolling out of frame; if set to a negative value the last N rows will be frozen.
groups = Dict(allow_refs=True, class_=<class 'dict'>, default={}, label='Groups', nested_refs=True): Dictionary mapping defining the groups.
groupby = List(allow_refs=True, bounds=(0, None), default=[], label='Groupby', nested_refs=True): Groups rows in the table by one or more columns.
header_align = ClassSelector(allow_refs=True, class_=(<class 'dict'>, <class 'str'>), default={}, label='Header align', nested_refs=True): A mapping from column name to alignment or a fixed column alignment, which should be one of ‘left’, ‘center’, ‘right’.
header_filters = ClassSelector(allow_None=True, allow_refs=True, class_=(<class 'bool'>, <class 'dict'>), label='Header filters', nested_refs=True): Whether to enable filters in the header or dictionary configuring filters for each column.
header_tooltips = Dict(allow_refs=True, class_=<class 'dict'>, default={}, label='Header tooltips'): Dictionary mapping from column name to a tooltip to show when hovering over the column header.
hidden_columns = List(allow_refs=True, bounds=(0, None), default=[], label='Hidden columns', nested_refs=True): List of columns to hide.

layout = Selector(allow_refs=True, default='fit_data_table', label='Layout', names={}, objects=['fit_data', 'fit_data_fill', 'fit_data_stretch', 'fit_data_table', 'fit_columns'])

initial_page_size = Integer(allow_refs=True, bounds=(1, None), default=20, inclusive_bounds=(True, True), label='Initial page size'): Initial page size if page_size is None and therefore automatically set.

pagination = Selector(allow_None=True, allow_refs=True, label='Pagination', names={}, objects=['local', 'remote'])

page = Integer(allow_refs=True, default=1, inclusive_bounds=(True, True), label='Page'): Currently selected page (indexed starting at 1), if pagination is enabled.
page_size = Integer(allow_None=True, allow_refs=True, bounds=(1, None), inclusive_bounds=(True, True), label='Page size'): Number of rows to render per page, if pagination is enabled.
row_content = Callable(allow_None=True, allow_refs=True, label='Row content'): A function which is given the DataFrame row and should return a Panel object to render as additional detail below the row.
selectable = ClassSelector(allow_refs=True, class_=(<class 'bool'>, <class 'str'>, <class 'int'>), default=True, label='Selectable'): Defines the selection mode of the Tabulator. - True Selects rows on click. To select multiple use Ctrl-select, to select a range use Shift-select - False Disables selection - ‘checkbox’ Adds a column of checkboxes to toggle selections - ‘checkbox-single’ Same as ‘checkbox’ but header does not allow select/deselect all - ‘toggle’ Selection toggles when clicked - int The maximum number of selectable rows.
selectable_rows = Callable(allow_None=True, allow_refs=True, label='Selectable rows'): A function which given a DataFrame should return a list of rows by integer index, which are selectable.
sortable = ClassSelector(allow_refs=True, class_=(<class 'bool'>, <class 'dict'>), default=True, label='Sortable'): Whether the columns in the table should be sortable. Can either be specified as a simple boolean toggling the behavior on and off or as a dictionary specifying the option per column.
theme = Selector(allow_refs=True, default='simple', label='Theme', names={}, objects=['default', 'site', 'simple', 'midnight', 'modern', 'bootstrap', 'bootstrap4', 'materialize', 'bulma', 'semantic-ui', 'fast', 'bootstrap5']): Tabulator CSS theme to apply to table.
theme_classes = List(allow_refs=True, bounds=(0, None), class_=<class 'str'>, default=[], item_type=<class 'str'>, label='Theme classes', nested_refs=True): List of extra CSS classes to apply to the Tabulator element to customize the theme.
title_formatters = Dict(allow_refs=True, class_=<class 'dict'>, default={}, label='Title formatters', nested_refs=True): Tabulator formatter specification to use for a particular column header title.

property current_view: pd.DataFrame#: Returns the current view of the table after filtering and sorting are applied.

download(filename: str = 'table.csv')[source]#

Triggers downloading of the table as a CSV or JSON.

Parameters:

filename: str: The filename to save the table as.

download_menu(text_kwargs={}, button_kwargs={})[source]#

Returns a menu containing a TextInput and Button widget to set the filename and trigger a client-side download of the data.

Parameters:

text_kwargs: dict: Keyword arguments passed to the TextInput constructor
button_kwargs: dict: Keyword arguments passed to the Button constructor

Returns:

filename: TextInput: The TextInput widget setting a filename.
button: Button: The Button that triggers a download.

on_click(callback: Callable[[CellClickEvent], None], column: str | None = None)[source]#

Register a callback to be executed when any cell is clicked. The callback is given a CellClickEvent declaring the column and row of the cell that was clicked.

Parameters:

callback: (callable): The callback to run on edit events.
column: (str): Optional argument restricting the callback to a specific column.

on_edit(callback: Callable[[TableEditEvent], None])[source]#

Register a callback to be executed when a cell is edited. Whenever a cell is edited on_edit callbacks are called with a TableEditEvent as the first argument containing the column, row and value of the edited cell.

Parameters:

callback: (callable): The callback to run on edit events.

stream(stream_value, rollover=None, reset_index=True, follow=True)[source]#

Streams (appends) the stream_value provided to the existing value in an efficient manner.

Parameters:

stream_value: (pd.DataFrame | pd.Series | Dict): The new value(s) to append to the existing value.
rollover: int: A maximum column size, above which data from the start of the column begins to be discarded. If None, then columns will continue to grow unbounded.
reset_index: (bool, default=True): If True and the stream_value is a DataFrame, then its index is reset. Helps to keep the index unique and named index

Raises:

ValueError: Raised if the stream_value is not a supported type.

Examples

Stream a Series to a DataFrame >>> value = pd.DataFrame({“x”: [1, 2], “y”: [“a”, “b”]}) >>> tabulator = Tabulator(value=value) >>> stream_value = pd.Series({“x”: 4, “y”: “d”}) >>> tabulator.stream(stream_value) >>> tabulator.value.to_dict(“list”) {‘x’: [1, 2, 4], ‘y’: [‘a’, ‘b’, ‘d’]}

Stream a Dataframe to a Dataframe >>> value = pd.DataFrame({“x”: [1, 2], “y”: [“a”, “b”]}) >>> tabulator = Tabulator(value=value) >>> stream_value = pd.DataFrame({“x”: [3, 4], “y”: [“c”, “d”]}) >>> tabulator.stream(stream_value) >>> tabulator.value.to_dict(“list”) {‘x’: [1, 2, 3, 4], ‘y’: [‘a’, ‘b’, ‘c’, ‘d’]}

Stream a Dictionary row to a DataFrame >>> value = pd.DataFrame({“x”: [1, 2], “y”: [“a”, “b”]}) >>> tabulator = Tabulator(value=value) >>> stream_value = {“x”: 4, “y”: “d”} >>> tabulator.stream(stream_value) >>> tabulator.value.to_dict(“list”) {‘x’: [1, 2, 4], ‘y’: [‘a’, ‘b’, ‘d’]}

Stream a Dictionary of Columns to a Dataframe >>> value = pd.DataFrame({“x”: [1, 2], “y”: [“a”, “b”]}) >>> tabulator = Tabulator(value=value) >>> stream_value = {“x”: [3, 4], “y”: [“c”, “d”]} >>> tabulator.stream(stream_value) >>> tabulator.value.to_dict(“list”) {‘x’: [1, 2, 3, 4], ‘y’: [‘a’, ‘b’, ‘c’, ‘d’]}

class panel.widgets.Terminal(output=None, **params)[source]#

Bases: Widget

The Terminal widget renders a live terminal in the browser using the xterm.js library making it possible to display logs or even provide an interactive terminal in a Panel application.

Reference: https://panel.holoviz.org/reference/widgets/Terminal.html

Example:

>>> Terminal(
...     "Welcome to the Panel Terminal!", options={"cursorBlink": True}
... )

Attributes:

clear
closed
subprocess: The subprocess enables running commands like ‘ls’, [‘ls’, ‘-l’], ‘bash’, ‘python’ and ‘ipython’ in the terminal.

Methods

fileno
flush
getvalue
read
readable
readlines
seekable
writable
write
writelines

Parameter Definitions

Parameters inherited from:

value = String(constant=True, default='', readonly=True): User input received from the Terminal. Sent one character at the time.
clear = Action(allow_None=True, constant=True, label='Clear'): Clears the Terminal.
options = Dict(class_=<class 'dict'>, default={}, label='Options'): Initial Options for the Terminal Constructor. cf. https://xtermjs.org/docs/api/terminal/interfaces/iterminaloptions/
output = String(default='', label='Output'): System output written to the Terminal
ncols = Integer(constant=True, default=0, inclusive_bounds=(True, True), label='Ncols', readonly=True): The number of columns in the terminal.
nrows = Integer(constant=True, default=0, inclusive_bounds=(True, True), label='Nrows', readonly=True): The number of rows in the terminal.
write_to_console = Boolean(default=False, label='Write to console'): Whether or not to write to the server console.
_clears = Integer(default=0, inclusive_bounds=(True, True), label=' clears'): Sends a signal to clear the terminal

_output = String(default='', label=' output')

property subprocess#: The subprocess enables running commands like ‘ls’, [‘ls’, ‘-l’], ‘bash’, ‘python’ and ‘ipython’ in the terminal.

class panel.widgets.TextAreaInput(**params: Any)[source]#

Bases: _TextInputBase

`.

Parameter Definitions

Parameters inherited from:

auto_grow = Boolean(default=False, label='Auto grow'): Whether the text area should automatically grow vertically to accommodate the current text.
cols = Integer(default=20, inclusive_bounds=(True, True), label='Cols'): Number of columns in the text input field.
max_rows = Integer(allow_None=True, inclusive_bounds=(True, True), label='Max rows'): When combined with auto_grow this determines the maximum number of rows the input area can grow.
rows = Integer(default=2, inclusive_bounds=(True, True), label='Rows'): Number of rows in the text input field.
resizable = Selector(default='both', label='Resizable', names={}, objects=['both', 'width', 'height', False]): Whether the layout is interactively resizable, and if so in which dimensions: width, height, or both. Can only be set during initialization.

class panel.widgets.TextEditor(**params: Any)[source]#

Bases: Widget

The TextEditor widget provides a WYSIWYG (what-you-see-is-what-you-get) rich text editor which outputs HTML.

The editor is built on top of the [Quill.js](https://quilljs.com/) library.

Reference: https://panel.holoviz.org/reference/widgets/TextEditor.html

Example:

>>> TextEditor(placeholder='Enter some text')

Parameter Definitions

Parameters inherited from:

value = String(default='', label='Value'): State of the current text in the editor
disabled = Boolean(default=False, label='Disabled'): Whether the editor is disabled.
mode = Selector(default='toolbar', label='Mode', names={}, objects=['bubble', 'toolbar']): Whether to display a toolbar or a bubble menu on highlight.
toolbar = ClassSelector(class_=(<class 'list'>, <class 'bool'>), default=True, label='Toolbar'): Toolbar configuration either as a boolean toggle or a configuration specified as a list.
placeholder = String(default='', label='Placeholder'): Placeholder output when the editor is empty.

class panel.widgets.TextInput(**params: Any)[source]#

Bases: _TextInputBase

The TextInput widget allows entering any string using a text input box.

Reference: https://panel.holoviz.org/reference/widgets/TextInput.html

Example:

>>> TextInput(name='Name', placeholder='Enter your name here ...')

Parameter Definitions

Parameters inherited from:

enter_pressed = Event(allow_refs=True, default=False, label='Enter pressed'): Event when the enter key has been pressed.

class panel.widgets.TextToSpeech(*, _voices, auto_speak, cancel, pause, resume, speak, lang, pitch, rate, voice, volume, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: Utterance, Widget

The TextToSpeech widget wraps the HTML5 SpeechSynthesis API

See https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis

Reference: https://panel.holoviz.org/reference/widgets/TextToSpeech.html

Example:

>>> TextToSpeech(name="Speech Synthesis", value="Data apps are nice")

Parameter Definitions

Parameters inherited from:

auto_speak = Boolean(default=True, label='Auto speak'): Whether or not to automatically speak when the value changes.
cancel = Event(default=False, label='Cancel'): Removes all utterances from the utterance queue.
pause = Event(default=False, label='Pause'): Puts the TextToSpeak object into a paused state.
resume = Event(default=False, label='Resume'): Puts the TextToSpeak object into a non-paused state: resumes it if it was already paused.
paused = Boolean(constant=True, default=False, label='Paused', readonly=True): A Boolean that returns true if the TextToSpeak object is in a paused state.
pending = Boolean(constant=True, default=False, label='Pending', readonly=True): A Boolean that returns true if the utterance queue contains as-yet-unspoken utterances.
speak = Event(default=False, label='Speak'): Speak. I.e. send a new Utterance to the browser
speaking = Boolean(constant=True, default=False, label='Speaking', readonly=True): A Boolean that returns true if an utterance is currently in the process of being spoken — even if TextToSpeak is in a paused state.
voices = List(bounds=(0, None), constant=True, default=[], label='Voices', readonly=True): Returns a list of Voice objects representing all the available voices on the current device.

_voices = List(bounds=(0, None), default=[], label=' voices')

class panel.widgets.TimePicker(**params: Any)[source]#

Bases: _TimeCommon

The TimePicker allows selecting a time value using a text box and a time-picking utility.

Reference: https://panel.holoviz.org/reference/widgets/TimePicker.html

Example:

>>> TimePicker(
...     value="12:59:31", start="09:00:00", end="18:00:00", name="Time"
... )

Parameter Definitions

Parameters inherited from:

value = ClassSelector(allow_None=True, class_=(<class 'datetime.time'>, <class 'str'>), label='Value'): The current value
start = ClassSelector(allow_None=True, class_=(<class 'datetime.time'>, <class 'str'>), label='Start'): Inclusive lower bound of the allowed time selection
end = ClassSelector(allow_None=True, class_=(<class 'datetime.time'>, <class 'str'>), label='End'): Inclusive upper bound of the allowed time selection
format = String(default='H:i', label='Format'): Formatting specification for the display of the picked date. +—+————————————+————+ | H | Hours (24 hours) | 00 to 23 | | h | Hours | 1 to 12 | | G | Hours, 2 digits with leading zeros | 1 to 12 | | i | Minutes | 00 to 59 | | S | Seconds, 2 digits | 00 to 59 | | s | Seconds | 0, 1 to 59 | | K | AM/PM | AM or PM | +—+————————————+————+ See also https://flatpickr.js.org/formatting/#date-formatting-tokens.

class panel.widgets.Toggle(**params)[source]#

Bases: _ButtonBase, IconMixin

The Toggle widget allows toggling a single condition between True/False states.

This widget is interchangeable with the Checkbox widget.

Reference: https://panel.holoviz.org/reference/widgets/Toggle.html

Example:

>>> Toggle(name='Toggle', button_type='success')

Parameter Definitions

Parameters inherited from:

value = Boolean(default=False, label='Value'): Whether the button is currently toggled.

class panel.widgets.ToggleGroup(*, options, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: SingleSelectBase

This class is a factory of ToggleGroup widgets.

A ToggleGroup is a group of widgets which can be switched ‘on’ or ‘off’.

Two types of widgets are available through the widget_type argument :

‘button’ (default)
‘box’

Two different behaviors are available through behavior argument:

‘check’ (default)boolean
Any number of widgets can be selected. In this case value is a ‘list’ of objects.
‘radio’boolean
One and only one widget is switched on. In this case value is an ‘object’.

Parameter Definitions

Parameters inherited from:

class panel.widgets.ToggleIcon(*, active_icon, icon, size, description, description_delay, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: _ClickableIcon, TooltipMixin

The ToggleIcon widget allows toggling a single condition between True/False states. This widget is interchangeable with the Checkbox and Toggle widget.

This widget incorporates a value attribute, which alternates between False and True.

Reference: https://panel.holoviz.org/reference/widgets/ToggleIcon.html

Example:

>>> pn.widgets.ToggleIcon(
...     icon="thumb-up", active_icon="thumb-down", size="4em", description="Like"
... )

Parameter Definitions

Parameters inherited from:

class panel.widgets.TooltipIcon(**params: Any)[source]#

Bases: Widget

The TooltipIcon displays a small ? icon. When you hover over the ? icon, the value will display.

Use the TooltipIcon to provide

helpful information to users without taking up a lot of screen space
tooltips next to Panel widgets that do not support tooltips yet.

Reference: https://panel.holoviz.org/reference/indicators/TooltipIcon.html

Example:

>>> pn.widgets.TooltipIcon(value="This is a simple tooltip by using a string")

Parameter Definitions

Parameters inherited from:

value = ClassSelector(class_=(<class 'str'>, <class 'bokeh.models.ui.tooltips.Tooltip'>), default='Description', label='Value'): The description in the tooltip.
align = Align(default='center', label='Align'): Whether the object should be aligned with the start, end or center of its container. If set as a tuple it will declare (vertical, horizontal) alignment.

class panel.widgets.Tqdm(*, layout, lock, max, progress, text, text_pane, write_to_console, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: Indicator

The Tqdm indicator wraps the well known tqdm progress indicator and displays the progress towards some target in your Panel app.

Reference: https://panel.holoviz.org/reference/indicators/Tqdm.html

Example:

>>> tqdm = Tqdm()
>>> for i in tqdm(range(0,10), desc="My loop", leave=True, colour='#666666'):
...     time.sleep(timeout)

Methods

`get_lock`()
`reset`()	Resets the parameters
`set_lock`(lock)

pandas

Parameter Definitions

Parameters inherited from:

value = Integer(bounds=(-1, None), default=0, inclusive_bounds=(True, True), label='Value'): The current value of the progress bar. If set to -1 the progress bar will be indeterminate and animate depending on the active parameter.
margin = Parameter(default=0, label='Margin'): Allows to create additional space around the component. May be specified as a two-tuple of the form (vertical, horizontal) or a four-tuple (top, right, bottom, left).
width = Integer(bounds=(0, None), default=400, inclusive_bounds=(True, True), label='Width'): The width of the component (in pixels). This can be either fixed or preferred width, depending on width sizing policy.
layout = ClassSelector(allow_None=True, class_=(<class 'panel.layout.base.Column'>, <class 'panel.layout.base.Row'>), constant=True, label='Layout'): The layout for the text and progress indicator.
lock = ClassSelector(allow_None=True, class_=<class 'object'>, label='Lock'): The multithreading.Lock or multiprocessing.Lock object to be used by Tqdm.
max = Integer(default=100, inclusive_bounds=(True, True), label='Max'): The maximum value of the progress bar.
progress = ClassSelector(allow_None=True, class_=<class 'panel.widgets.indicators.Progress'>, label='Progress'): The Progress indicator used to display the progress.
text = String(default='', label='Text'): The current tqdm style progress text.
text_pane = ClassSelector(allow_None=True, class_=<class 'panel.pane.markup.Str'>, label='Text pane'): The pane to display the text to.
write_to_console = Boolean(default=False, label='Write to console'): Whether or not to also write to the console.

reset()[source]#: Resets the parameters

class panel.widgets.Trend(*, data, layout, neg_color, plot_color, plot_type, plot_x, plot_y, pos_color, value_change, selection, disabled, loading, align, aspect_ratio, css_classes, design, height, height_policy, margin, max_height, max_width, min_height, min_width, sizing_mode, styles, stylesheets, tags, visible, width, width_policy, value, name)[source]#

Bases: SyncableData, Indicator

The Trend indicator enables the user to display a dashboard kpi card.

The card can be layout out as:

a column (text and plot on top of each other) or a row (text and
plot after each other)

Reference: https://panel.holoviz.org/reference/indicators/Trend.html

Example:

>>> data = {'x': np.arange(50), 'y': np.random.randn(50).cumsum()}
>>> Trend(name='Price', data=data, plot_type='area', width=200, height=200)

Parameter Definitions

Parameters inherited from:

value = Parameter(default='auto', label='Value'): The primary value to be displayed.
sizing_mode = Selector(label='Sizing mode', names={}, objects=['fixed', 'stretch_width', 'stretch_height', 'stretch_both', 'scale_width', 'scale_height', 'scale_both', None]): How the component should size itself. This is a high-level setting for maintaining width and height of the component. To gain more fine grained control over sizing, use width_policy, height_policy and aspect_ratio instead (those take precedence over sizing_mode). "fixed" Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events. "stretch_width" Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents. "stretch_height" Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents. "stretch_both" Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component. "scale_width" Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio. "scale_height" Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio. "scale_both" Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.
data = Parameter(allow_None=True, label='Data'): The plot data declared as a dictionary of arrays or a DataFrame.

layout = Selector(default='column', label='Layout', names={}, objects=['column', 'row'])

plot_x = String(default='x', label='Plot x'): The name of the key in the plot_data to use on the x-axis.
plot_y = String(default='y', label='Plot y'): The name of the key in the plot_data to use on the y-axis.
plot_color = String(default='#428bca', label='Plot color'): The color to use in the plot.
plot_type = Selector(default='bar', label='Plot type', names={}, objects=['line', 'step', 'area', 'bar']): The plot type to render the plot data as.
pos_color = String(default='#5cb85c', label='Pos color'): The color used to indicate a positive change.
neg_color = String(default='#d9534f', label='Neg color'): The color used to indicate a negative change.
value_change = Parameter(default='auto', label='Value change'): A secondary value. For example the change in percent.

sizing_mode = None#

class panel.widgets.Utterance(*, lang, pitch, rate, value, voice, volume, name)[source]#

Bases: Parameterized

An utterance is the smallest unit of speech in spoken language analysis.

The Utterance Model wraps the HTML5 SpeechSynthesisUtterance API

See https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisUtterance

Methods

`set_voices`(voices)	Updates the lang and voice parameter objects, default and value
`to_dict`([include_uuid])	Returns the object parameter values in a dictionary

Parameter Definitions

value = String(default='', label='Value'): The text that will be synthesised when the utterance is spoken. The text may be provided as plain text, or a well-formed SSML document.
lang = Selector(default='', label='Lang', names={}, objects=['']): The language of the utterance.
pitch = Number(bounds=(0.0, 2.0), default=1.0, inclusive_bounds=(True, True), label='Pitch'): The pitch at which the utterance will be spoken at expressed as a number between 0 and 2.
rate = Number(bounds=(0.1, 10.0), default=1.0, inclusive_bounds=(True, True), label='Rate'): The speed at which the utterance will be spoken at expressed as a number between 0.1 and 10.
voice = Selector(label='Voice', names={}, objects=[]): The voice that will be used to speak the utterance.
volume = Number(bounds=(0.0, 1.0), default=1.0, inclusive_bounds=(True, True), label='Volume'): The volume that the utterance will be spoken at expressed as a number between 0 and 1.

set_voices(voices)[source]#: Updates the lang and voice parameter objects, default and value

to_dict(include_uuid=True)[source]#

Returns the object parameter values in a dictionary

Returns:: Dict: [description]

class panel.widgets.VideoStream(**params: Any)[source]#

Bases: Widget

The VideoStream displays a video from a local stream (for example from a webcam) and allows accessing the streamed video data from Python.

Reference: https://panel.holoviz.org/reference/widgets/VideoStream.html

Example:

>>> VideoStream(name='Video Stream', timeout=100)

Methods

snapshot()

Triggers a snapshot of the current VideoStream state to sync the widget value.

Parameter Definitions

Parameters inherited from:

value = String(default='', label='Value'): A base64 representation of the video stream snapshot.
format = Selector(default='png', label='Format', names={}, objects=['png', 'jpeg']): The file format as which the video is returned.
paused = Boolean(default=False, label='Paused'): Whether the video is currently paused
timeout = Number(allow_None=True, inclusive_bounds=(True, True), label='Timeout'): Interval between snapshots in millisecons

snapshot()[source]#: Triggers a snapshot of the current VideoStream state to sync the widget value.

class panel.widgets.Voice(*, default, lang, local_service, voice_uri, name)[source]#

Bases: Parameterized

The current device (i.e. OS and Browser) provides a list of Voices. Each with a unique name and speaking a specific language.

Wraps the HTML5 SpeecSynthesisVoice API

See https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisVoice

Methods

`group_by_lang`(voices)	Returns a dictionary where the key is the lang and the value is a list of voices for that language.
`to_voices_list`(voices)	Returns a list of Voice objects from the list of dicts provided

Parameter Definitions

default = Boolean(constant=True, default=False, label='Default'): A Boolean indicating whether the voice is the default voice for the current app language (True), or not (False.)
lang = String(constant=True, default='', label='Lang'): Returns a BCP 47 language tag indicating the language of the voice.
local_service = Boolean(constant=True, default=False, label='Local service'): A Boolean indicating whether the voice is supplied by a local speech synthesizer service (True), or a remote speech synthesizer service (False.)
voice_uri = String(constant=True, default='', label='Voice uri'): Returns the type of URI and location of the speech synthesis service for this voice.

static group_by_lang(voices)[source]#: Returns a dictionary where the key is the lang and the value is a list of voices for that language.

static to_voices_list(voices)[source]#: Returns a list of Voice objects from the list of dicts provided

class panel.widgets.Widget(**params: Any)[source]#

Bases: Reactive, WidgetBase

Widgets allow syncing changes in bokeh widget models with the parameters on the Widget instance.

Parameter Definitions

Parameters inherited from:

height = Integer(allow_None=True, allow_refs=True, bounds=(0, None), inclusive_bounds=(True, True), label='Height'): The height of the component (in pixels). This can be either fixed or preferred height, depending on height sizing policy.
margin = Margin(allow_None=True, allow_refs=True, default=(5, 10), label='Margin'): Allows to create additional space around the component. May be specified as a two-tuple of the form (vertical, horizontal) or a four-tuple (top, right, bottom, left).
width = Integer(allow_None=True, allow_refs=True, bounds=(0, None), inclusive_bounds=(True, True), label='Width'): The width of the component (in pixels). This can be either fixed or preferred width, depending on width sizing policy.
disabled = Boolean(allow_refs=True, default=False, label='Disabled'): Whether the widget is disabled.