param Module

param Module

Defines the Param pane which converts Parameterized classes into a set of widgets.

class panel.param.Param(object=None, **params)

Bases: PaneBase

Param panes render a Parameterized class to a set of widgets which are linked to the parameter values on the class.

Parameters inherited from:

panel.viewable.Layoutable: align, aspect_ratio, css_classes, design, min_width, min_height, max_width, max_height, styles, stylesheets, tags, width_policy, height_policy, sizing_mode, visible

panel.viewable.Viewable: loading

panel.pane.base.PaneBase: margin

height = param.Integer(allow_None=True, allow_refs=False, bounds=(0, None), inclusive_bounds=(True, True), label=’Height’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x17fa01f90>)

Height of widgetbox the parameter widgets are displayed in.

width = param.Integer(allow_None=True, allow_refs=False, bounds=(0, None), inclusive_bounds=(True, True), label=’Width’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x1676af350>)

Width of widgetbox the parameter widgets are displayed in.

default_layout = param.ClassSelector(allow_refs=False, class_=<class ‘panel.layout.base.Panel’>, default=<class ‘panel.layout.base.Column’>, label=’Default layout’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x166ed1dd0>)

Defines the layout the model(s) returned by the pane will be placed in.

object = param.Parameter(allow_None=True, allow_refs=False, label=’Object’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x165a42050>)

The object being wrapped, which will be converted to a Bokeh model.

display_threshold = param.Number(allow_refs=False, default=0, inclusive_bounds=(True, True), label=’Display threshold’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x1649aa110>)

Parameters with precedence below this value are not displayed.

default_precedence = param.Number(allow_refs=False, default=1e-08, inclusive_bounds=(True, True), label=’Default precedence’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x17fc1a790>)

Precedence value to use for parameters with no declared precedence. By default, zero predecence is available for forcing some parameters to the top of the list, and other values above the default_precedence values can be used to sort or group parameters arbitrarily.

expand = param.Boolean(allow_refs=False, default=False, label=’Expand’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x17fa01f90>)

Whether parameterized subobjects are expanded or collapsed on instantiation.

expand_button = param.Boolean(allow_None=True, allow_refs=False, label=’Expand button’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x165a42050>)

Whether to add buttons to expand and collapse sub-objects.

expand_layout = param.Parameter(allow_refs=False, default=<class ‘panel.layout.base.Column’>, label=’Expand layout’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x17fa01f90>)

Layout to expand sub-objects into.

hide_constant = param.Boolean(allow_refs=False, default=False, label=’Hide constant’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x165a42050>)

Whether to hide widgets of constant parameters.

initializer = param.Callable(allow_None=True, allow_refs=False, label=’Initializer’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x17fc09810>)

User-supplied function that will be called on initialization, usually to update the default Parameter values of the underlying parameterized object.

parameters = param.List(allow_None=True, allow_refs=False, bounds=(0, None), default=[], label=’Parameters’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x17fc5fcd0>)

If set this serves as a allowlist of parameters to display on the supplied Parameterized object.

show_labels = param.Boolean(allow_refs=False, default=True, label=’Show labels’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x1678f15d0>)

Whether to show labels for each widget

show_name = param.Boolean(allow_refs=False, default=True, label=’Show name’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x1670ae750>)

Whether to show the parameterized object’s name

sort = param.ClassSelector(allow_refs=False, class_=(<class ‘bool’>, <class ‘collections.abc.Callable’>), default=False, label=’Sort’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x1678f2fd0>)

If True the widgets will be sorted alphabetically by label. If a callable is provided it will be used to sort the Parameters, for example lambda x: x[1].label[::-1] will sort by the reversed label.

widgets = param.Dict(allow_None=True, allow_refs=False, class_=<class ‘dict’>, label=’Widgets’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x165a42050>)

Dictionary of widget overrides, mapping from parameter name to widget class.

classmethod applies(obj: Any) → float | bool | None

Returns boolean or float indicating whether the Pane can render the object.

If the priority of the pane is set to None, this method may also be used to define a float priority depending on the object being rendered.

clone(object: Optional[Any] = None, **params) → T

Makes a copy of the Pane sharing the same parameters.

Parameters:

• object (Optional new object to render) –

• params (Keyword arguments override the parameters on the clone.) –

Return type:

Cloned Pane object

controls(parameters: List[str] = [], jslink: bool = True, **kwargs) → Panel

Creates a set of widgets which allow manipulating the parameters on this instance. By default all parameters which support linking are exposed, but an explicit list of parameters can be provided.

Parameters:

• parameters (list(str)) – An explicit list of parameters to return controls for.

• jslink (bool) – Whether to use jslinks instead of Python based links. This does not allow using all types of parameters.

• kwargs (dict) – Additional kwargs to pass to the Param pane(s) used to generate the controls widgets.

Return type:

A layout of the controls

default_layout

alias of Column

embed(max_states: int = 1000, max_opts: int = 3, json: bool = False, json_prefix: str = '', save_path: str = './', load_path: Optional[str] = None, progress: bool = False, states={}) → None

Renders a static version of a panel in a notebook by evaluating the set of states defined by the widgets in the model. Note this will only work well for simple apps with a relatively small state space.

Parameters:

• max_states (int) – The maximum number of states to embed

• max_opts (int) – The maximum number of states for a single widget

• json (boolean (default=True)) – Whether to export the data to json files

• json_prefix (str (default='')) – Prefix for JSON filename

• save_path (str (default='./')) – The path to save json files to

• load_path (str (default=None)) – The path or URL the json files will be loaded from.

• progress (boolean (default=False)) – Whether to report progress

• states (dict (default={})) – A dictionary specifying the widget values to embed for each widget

expand_layout

alias of Column

classmethod get_pane_type(obj: Any, **kwargs) → Type[PaneBase]

Returns the applicable Pane type given an object by resolving the precedence of all types whose applies method declares that the object is supported.

Parameters:

(object) (obj) –

Return type:

The applicable Pane type with the highest precedence.

get_root(doc: Optional[Document] = None, comm: Comm | None = None, preprocess: bool = True) → Model

Returns the root model and applies pre-processing hooks

Parameters:

• doc (bokeh.document.Document) – Optional Bokeh document the bokeh model will be attached to.

• comm (pyviz_comms.Comm) – Optional pyviz_comms when working in notebook

• preprocess (bool (default=True)) – Whether to run preprocessing hooks

Return type:

Returns the bokeh model corresponding to this panel object

jscallback(args: Dict[str, Any] = {}, **callbacks: str) → Callback

Allows defining a JS callback to be triggered when a property changes on the source object. The keyword arguments define the properties that trigger a callback and the JS code that gets executed.

Parameters:

• args (dict) – A mapping of objects to make available to the JS callback

• **callbacks (dict) – A mapping between properties on the source model and the code to execute when that property changes

Returns:

callback – The Callback which can be used to disable the callback.

Return type:

Callback

jslink(target: JSLinkTarget, code: Dict[str, str] = None, args: Optional[Dict] = None, bidirectional: bool = False, **links: str) → Link

Links properties on the this Reactive object to those on the target Reactive object in 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 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

• **links (dict) – A mapping between properties on the source model and the target model property to link it to.

Returns:

link – The GenericLink which can be used unlink the widget and the target model.

Return type:

GenericLink

link(target: Parameterized, callbacks: Optional[Dict[str, Union[str, Callable]]] = None, bidirectional: bool = False, **links: str) → Watcher

Links the parameters on this Reactive object to attributes on the target Parameterized object.

Supports two modes, either specify a mapping between the source and target object parameters as keywords or provide a dictionary of callbacks which maps from the source parameter to a callback which is triggered when the parameter changes.

Parameters:

• target (param.Parameterized) – The target object of the link.

• callbacks (dict | None) – Maps from a parameter in the source object to a callback.

• bidirectional (bool) – Whether to link source and target bi-directionally

• **links (dict) – Maps between parameters on this object to the parameters on the supplied object.

save(filename: str | os.PathLike | IO, title: Optional[str] = None, resources: bokeh.resources.Resources | None = None, template: str | jinja2.environment.Template | None = None, template_variables: Dict[str, Any] = {}, embed: bool = False, max_states: int = 1000, max_opts: int = 3, embed_json: bool = False, json_prefix: str = '', save_path: str = './', load_path: Optional[str] = None, progress: bool = True, embed_states: Dict[Any, Any] = {}, as_png: bool | None = None, **kwargs) → None

Saves Panel objects to file.

Parameters:

• filename (str or file-like object) – Filename to save the plot to

• title (string) – Optional title for the plot

• resources (bokeh resources) – One of the valid bokeh.resources (e.g. CDN or INLINE)

• template – passed to underlying io.save

• template_variables – passed to underlying io.save

• embed (bool) – Whether the state space should be embedded in the saved file.

• max_states (int) – The maximum number of states to embed

• max_opts (int) – The maximum number of states for a single widget

• embed_json (boolean (default=True)) – Whether to export the data to json files

• json_prefix (str (default='')) – Prefix for the auto-generated json directory

• save_path (str (default='./')) – The path to save json files to

• load_path (str (default=None)) – The path or URL the json files will be loaded from.

• progress (boolean (default=True)) – Whether to report progress

• embed_states (dict (default={})) – A dictionary specifying the widget values to embed for each widget

• as_png (boolean (default=None)) – To save as a .png. If None save_png will be true if filename is string and ends with png.

select(selector=None)

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

Return type:

list(Viewable)

servable(title: Optional[str] = None, location: bool | 'Location' = True, area: str = 'main', target: Optional[str] = None) → ServableMixin

Serves the object or adds it to the configured pn.state.template if in a panel serve context, writes to the DOM if in a pyodide context and returns the Panel object to allow it to display itself in a notebook context.

Parameters:

• title (str) – A string title to give the Document (if served as an app)

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

• area (str (deprecated)) – The area of a template to add the component too. Only has an effect if pn.config.template has been set.

• target (str) – Target area to write to. If a template has been configured on pn.config.template this refers to the target area in the template while in pyodide this refers to the ID of the DOM node to write to.

Return type:

The Panel object itself

server_doc(doc: Optional[Document] = None, title: Optional[str] = None, location: bool | 'Location' = True) → Document

Returns a serveable bokeh Document with the panel attached

Parameters:

• doc (bokeh.Document (optional)) – The bokeh Document to attach the panel to as a root, defaults to bokeh.io.curdoc()

• title (str) – A string title to give the Document

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

Returns:

doc – The bokeh document the panel was attached to

Return type:

bokeh.Document

show(title: Optional[str] = None, port: int = 0, address: Optional[str] = None, websocket_origin: Optional[str] = None, threaded: bool = False, verbose: bool = True, open: bool = True, location: bool | 'Location' = True, **kwargs) → StoppableThread' | 'Server

Starts a Bokeh server and displays the Viewable in a new tab.

Parameters:

• title (str | None) – A string title to give the Document (if served as an app)

• port (int (optional, default=0)) – Allows specifying a specific port

• address (str) – The address the server should listen on for HTTP requests.

• websocket_origin (str or list(str) (optional)) – A list of hosts that can connect to the websocket. This is typically required when embedding a server app in an external web site. If None, “localhost” is used.

• threaded (boolean (optional, default=False)) – Whether to launch the Server on a separate thread, allowing interactive use.

• verbose (boolean (optional, default=True)) – Whether to print the address and port

• open (boolean (optional, default=True)) – Whether to open the server in a new browser tab

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

Returns:

server – Returns the Bokeh server instance or the thread the server was launched on (if threaded=True)

Return type:

bokeh.server.Server or panel.io.server.StoppableThread

widget(p_name)

Get widget for param_name

class panel.param.ParamFunction(object=None, **params)

Bases: ParamRef

ParamFunction panes wrap functions decorated with the param.depends decorator and rerenders the output when any of the function’s dependencies change. This allows building reactive components into a Panel which depend on other parameters, e.g. tying the value of a widget to some other output.

Parameters inherited from:

panel.viewable.Layoutable: align, aspect_ratio, css_classes, design, height, min_width, min_height, max_width, max_height, styles, stylesheets, tags, width, width_policy, height_policy, sizing_mode, visible

panel.viewable.Viewable: loading

panel.pane.base.PaneBase: margin, default_layout

panel.pane.base.ReplacementPane: object, inplace, _pane

panel.param.ParamRef: defer_load, generator_mode, lazy, loading_indicator

classmethod applies(obj: Any, **kwargs) → float | bool | None

Returns boolean or float indicating whether the Pane can render the object.

If the priority of the pane is set to None, this method may also be used to define a float priority depending on the object being rendered.

clone(object: Optional[Any] = None, **params) → T

Makes a copy of the Pane sharing the same parameters.

Parameters:

• object (Optional new object to render) –

• params (Keyword arguments override the parameters on the clone.) –

Return type:

Cloned Pane object

controls(parameters: List[str] = [], jslink: bool = True, **kwargs) → Panel

Creates a set of widgets which allow manipulating the parameters on this instance. By default all parameters which support linking are exposed, but an explicit list of parameters can be provided.

Parameters:

• parameters (list(str)) – An explicit list of parameters to return controls for.

• jslink (bool) – Whether to use jslinks instead of Python based links. This does not allow using all types of parameters.

• kwargs (dict) – Additional kwargs to pass to the Param pane(s) used to generate the controls widgets.

Return type:

A layout of the controls

default_layout

alias of Row

embed(max_states: int = 1000, max_opts: int = 3, json: bool = False, json_prefix: str = '', save_path: str = './', load_path: Optional[str] = None, progress: bool = False, states={}) → None

Renders a static version of a panel in a notebook by evaluating the set of states defined by the widgets in the model. Note this will only work well for simple apps with a relatively small state space.

Parameters:

• max_states (int) – The maximum number of states to embed

• max_opts (int) – The maximum number of states for a single widget

• json (boolean (default=True)) – Whether to export the data to json files

• json_prefix (str (default='')) – Prefix for JSON filename

• save_path (str (default='./')) – The path to save json files to

• load_path (str (default=None)) – The path or URL the json files will be loaded from.

• progress (boolean (default=False)) – Whether to report progress

• states (dict (default={})) – A dictionary specifying the widget values to embed for each widget

classmethod get_pane_type(obj: Any, **kwargs) → Type[PaneBase]

Returns the applicable Pane type given an object by resolving the precedence of all types whose applies method declares that the object is supported.

Parameters:

(object) (obj) –

Return type:

The applicable Pane type with the highest precedence.

get_root(doc: Optional[Document] = None, comm: Comm | None = None, preprocess: bool = True) → Model

Returns the root model and applies pre-processing hooks

Parameters:

• doc (bokeh.document.Document) – Optional Bokeh document the bokeh model will be attached to.

• comm (pyviz_comms.Comm) – Optional pyviz_comms when working in notebook

• preprocess (bool (default=True)) – Whether to run preprocessing hooks

Return type:

Returns the bokeh model corresponding to this panel object

jscallback(args: Dict[str, Any] = {}, **callbacks: str) → Callback

Allows defining a JS callback to be triggered when a property changes on the source object. The keyword arguments define the properties that trigger a callback and the JS code that gets executed.

Parameters:

• args (dict) – A mapping of objects to make available to the JS callback

• **callbacks (dict) – A mapping between properties on the source model and the code to execute when that property changes

Returns:

callback – The Callback which can be used to disable the callback.

Return type:

Callback

jslink(target: JSLinkTarget, code: Dict[str, str] = None, args: Optional[Dict] = None, bidirectional: bool = False, **links: str) → Link

Links properties on the this Reactive object to those on the target Reactive object in 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 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

• **links (dict) – A mapping between properties on the source model and the target model property to link it to.

Returns:

link – The GenericLink which can be used unlink the widget and the target model.

Return type:

GenericLink

link(target: Parameterized, callbacks: Optional[Dict[str, Union[str, Callable]]] = None, bidirectional: bool = False, **links: str) → Watcher

Links the parameters on this Reactive object to attributes on the target Parameterized object.

Supports two modes, either specify a mapping between the source and target object parameters as keywords or provide a dictionary of callbacks which maps from the source parameter to a callback which is triggered when the parameter changes.

Parameters:

• target (param.Parameterized) – The target object of the link.

• callbacks (dict | None) – Maps from a parameter in the source object to a callback.

• bidirectional (bool) – Whether to link source and target bi-directionally

• **links (dict) – Maps between parameters on this object to the parameters on the supplied object.

save(filename: str | os.PathLike | IO, title: Optional[str] = None, resources: bokeh.resources.Resources | None = None, template: str | jinja2.environment.Template | None = None, template_variables: Dict[str, Any] = {}, embed: bool = False, max_states: int = 1000, max_opts: int = 3, embed_json: bool = False, json_prefix: str = '', save_path: str = './', load_path: Optional[str] = None, progress: bool = True, embed_states: Dict[Any, Any] = {}, as_png: bool | None = None, **kwargs) → None

Saves Panel objects to file.

Parameters:

• filename (str or file-like object) – Filename to save the plot to

• title (string) – Optional title for the plot

• resources (bokeh resources) – One of the valid bokeh.resources (e.g. CDN or INLINE)

• template – passed to underlying io.save

• template_variables – passed to underlying io.save

• embed (bool) – Whether the state space should be embedded in the saved file.

• max_states (int) – The maximum number of states to embed

• max_opts (int) – The maximum number of states for a single widget

• embed_json (boolean (default=True)) – Whether to export the data to json files

• json_prefix (str (default='')) – Prefix for the auto-generated json directory

• save_path (str (default='./')) – The path to save json files to

• load_path (str (default=None)) – The path or URL the json files will be loaded from.

• progress (boolean (default=True)) – Whether to report progress

• embed_states (dict (default={})) – A dictionary specifying the widget values to embed for each widget

• as_png (boolean (default=None)) – To save as a .png. If None save_png will be true if filename is string and ends with png.

select(selector: Optional[Union[type, Callable]] = None) → List[Viewable]

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

Parameters:

selector ((type | callable | None)) – The selector allows selecting a subset of Viewables by declaring a type or callable function to filter by.

Returns:

viewables

Return type:

list(Viewable)

servable(title: Optional[str] = None, location: bool | 'Location' = True, area: str = 'main', target: Optional[str] = None) → ServableMixin

Serves the object or adds it to the configured pn.state.template if in a panel serve context, writes to the DOM if in a pyodide context and returns the Panel object to allow it to display itself in a notebook context.

Parameters:

• title (str) – A string title to give the Document (if served as an app)

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

• area (str (deprecated)) – The area of a template to add the component too. Only has an effect if pn.config.template has been set.

• target (str) – Target area to write to. If a template has been configured on pn.config.template this refers to the target area in the template while in pyodide this refers to the ID of the DOM node to write to.

Return type:

The Panel object itself

server_doc(doc: Optional[Document] = None, title: Optional[str] = None, location: bool | 'Location' = True) → Document

Returns a serveable bokeh Document with the panel attached

Parameters:

• doc (bokeh.Document (optional)) – The bokeh Document to attach the panel to as a root, defaults to bokeh.io.curdoc()

• title (str) – A string title to give the Document

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

Returns:

doc – The bokeh document the panel was attached to

Return type:

bokeh.Document

show(title: Optional[str] = None, port: int = 0, address: Optional[str] = None, websocket_origin: Optional[str] = None, threaded: bool = False, verbose: bool = True, open: bool = True, location: bool | 'Location' = True, **kwargs) → StoppableThread' | 'Server

Starts a Bokeh server and displays the Viewable in a new tab.

Parameters:

• title (str | None) – A string title to give the Document (if served as an app)

• port (int (optional, default=0)) – Allows specifying a specific port

• address (str) – The address the server should listen on for HTTP requests.

• websocket_origin (str or list(str) (optional)) – A list of hosts that can connect to the websocket. This is typically required when embedding a server app in an external web site. If None, “localhost” is used.

• threaded (boolean (optional, default=False)) – Whether to launch the Server on a separate thread, allowing interactive use.

• verbose (boolean (optional, default=True)) – Whether to print the address and port

• open (boolean (optional, default=True)) – Whether to open the server in a new browser tab

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

Returns:

server – Returns the Bokeh server instance or the thread the server was launched on (if threaded=True)

Return type:

bokeh.server.Server or panel.io.server.StoppableThread

class panel.param.ParamMethod(object=None, **params)

Bases: ParamRef

ParamMethod panes wrap methods on parameterized classes and rerenders the plot when any of the method’s parameters change. By default ParamMethod will watch all parameters on the class owning the method or can be restricted to certain parameters by annotating the method using the param.depends decorator. The method may return any object which itself can be rendered as a Pane.

Parameters inherited from:

panel.viewable.Layoutable: align, aspect_ratio, css_classes, design, height, min_width, min_height, max_width, max_height, styles, stylesheets, tags, width, width_policy, height_policy, sizing_mode, visible

panel.viewable.Viewable: loading

panel.pane.base.PaneBase: margin, default_layout

panel.pane.base.ReplacementPane: object, inplace, _pane

panel.param.ParamRef: defer_load, generator_mode, lazy, loading_indicator

classmethod applies(obj: Any) → float | bool | None

Returns boolean or float indicating whether the Pane can render the object.

If the priority of the pane is set to None, this method may also be used to define a float priority depending on the object being rendered.

clone(object: Optional[Any] = None, **params) → T

Makes a copy of the Pane sharing the same parameters.

Parameters:

• object (Optional new object to render) –

• params (Keyword arguments override the parameters on the clone.) –

Return type:

Cloned Pane object

controls(parameters: List[str] = [], jslink: bool = True, **kwargs) → Panel

Creates a set of widgets which allow manipulating the parameters on this instance. By default all parameters which support linking are exposed, but an explicit list of parameters can be provided.

Parameters:

• parameters (list(str)) – An explicit list of parameters to return controls for.

• jslink (bool) – Whether to use jslinks instead of Python based links. This does not allow using all types of parameters.

• kwargs (dict) – Additional kwargs to pass to the Param pane(s) used to generate the controls widgets.

Return type:

A layout of the controls

default_layout

alias of Row

embed(max_states: int = 1000, max_opts: int = 3, json: bool = False, json_prefix: str = '', save_path: str = './', load_path: Optional[str] = None, progress: bool = False, states={}) → None

Renders a static version of a panel in a notebook by evaluating the set of states defined by the widgets in the model. Note this will only work well for simple apps with a relatively small state space.

Parameters:

• max_states (int) – The maximum number of states to embed

• max_opts (int) – The maximum number of states for a single widget

• json (boolean (default=True)) – Whether to export the data to json files

• json_prefix (str (default='')) – Prefix for JSON filename

• save_path (str (default='./')) – The path to save json files to

• load_path (str (default=None)) – The path or URL the json files will be loaded from.

• progress (boolean (default=False)) – Whether to report progress

• states (dict (default={})) – A dictionary specifying the widget values to embed for each widget

classmethod get_pane_type(obj: Any, **kwargs) → Type[PaneBase]

Returns the applicable Pane type given an object by resolving the precedence of all types whose applies method declares that the object is supported.

Parameters:

(object) (obj) –

Return type:

The applicable Pane type with the highest precedence.

get_root(doc: Optional[Document] = None, comm: Comm | None = None, preprocess: bool = True) → Model

Returns the root model and applies pre-processing hooks

Parameters:

• doc (bokeh.document.Document) – Optional Bokeh document the bokeh model will be attached to.

• comm (pyviz_comms.Comm) – Optional pyviz_comms when working in notebook

• preprocess (bool (default=True)) – Whether to run preprocessing hooks

Return type:

Returns the bokeh model corresponding to this panel object

jscallback(args: Dict[str, Any] = {}, **callbacks: str) → Callback

Allows defining a JS callback to be triggered when a property changes on the source object. The keyword arguments define the properties that trigger a callback and the JS code that gets executed.

Parameters:

• args (dict) – A mapping of objects to make available to the JS callback

• **callbacks (dict) – A mapping between properties on the source model and the code to execute when that property changes

Returns:

callback – The Callback which can be used to disable the callback.

Return type:

Callback

jslink(target: JSLinkTarget, code: Dict[str, str] = None, args: Optional[Dict] = None, bidirectional: bool = False, **links: str) → Link

Links properties on the this Reactive object to those on the target Reactive object in 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 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

• **links (dict) – A mapping between properties on the source model and the target model property to link it to.

Returns:

link – The GenericLink which can be used unlink the widget and the target model.

Return type:

GenericLink

link(target: Parameterized, callbacks: Optional[Dict[str, Union[str, Callable]]] = None, bidirectional: bool = False, **links: str) → Watcher

Links the parameters on this Reactive object to attributes on the target Parameterized object.

Supports two modes, either specify a mapping between the source and target object parameters as keywords or provide a dictionary of callbacks which maps from the source parameter to a callback which is triggered when the parameter changes.

Parameters:

• target (param.Parameterized) – The target object of the link.

• callbacks (dict | None) – Maps from a parameter in the source object to a callback.

• bidirectional (bool) – Whether to link source and target bi-directionally

• **links (dict) – Maps between parameters on this object to the parameters on the supplied object.

save(filename: str | os.PathLike | IO, title: Optional[str] = None, resources: bokeh.resources.Resources | None = None, template: str | jinja2.environment.Template | None = None, template_variables: Dict[str, Any] = {}, embed: bool = False, max_states: int = 1000, max_opts: int = 3, embed_json: bool = False, json_prefix: str = '', save_path: str = './', load_path: Optional[str] = None, progress: bool = True, embed_states: Dict[Any, Any] = {}, as_png: bool | None = None, **kwargs) → None

Saves Panel objects to file.

Parameters:

• filename (str or file-like object) – Filename to save the plot to

• title (string) – Optional title for the plot

• resources (bokeh resources) – One of the valid bokeh.resources (e.g. CDN or INLINE)

• template – passed to underlying io.save

• template_variables – passed to underlying io.save

• embed (bool) – Whether the state space should be embedded in the saved file.

• max_states (int) – The maximum number of states to embed

• max_opts (int) – The maximum number of states for a single widget

• embed_json (boolean (default=True)) – Whether to export the data to json files

• json_prefix (str (default='')) – Prefix for the auto-generated json directory

• save_path (str (default='./')) – The path to save json files to

• load_path (str (default=None)) – The path or URL the json files will be loaded from.

• progress (boolean (default=True)) – Whether to report progress

• embed_states (dict (default={})) – A dictionary specifying the widget values to embed for each widget

• as_png (boolean (default=None)) – To save as a .png. If None save_png will be true if filename is string and ends with png.

select(selector: Optional[Union[type, Callable]] = None) → List[Viewable]

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

Parameters:

selector ((type | callable | None)) – The selector allows selecting a subset of Viewables by declaring a type or callable function to filter by.

Returns:

viewables

Return type:

list(Viewable)

servable(title: Optional[str] = None, location: bool | 'Location' = True, area: str = 'main', target: Optional[str] = None) → ServableMixin

Serves the object or adds it to the configured pn.state.template if in a panel serve context, writes to the DOM if in a pyodide context and returns the Panel object to allow it to display itself in a notebook context.

Parameters:

• title (str) – A string title to give the Document (if served as an app)

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

• area (str (deprecated)) – The area of a template to add the component too. Only has an effect if pn.config.template has been set.

• target (str) – Target area to write to. If a template has been configured on pn.config.template this refers to the target area in the template while in pyodide this refers to the ID of the DOM node to write to.

Return type:

The Panel object itself

server_doc(doc: Optional[Document] = None, title: Optional[str] = None, location: bool | 'Location' = True) → Document

Returns a serveable bokeh Document with the panel attached

Parameters:

• doc (bokeh.Document (optional)) – The bokeh Document to attach the panel to as a root, defaults to bokeh.io.curdoc()

• title (str) – A string title to give the Document

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

Returns:

doc – The bokeh document the panel was attached to

Return type:

bokeh.Document

show(title: Optional[str] = None, port: int = 0, address: Optional[str] = None, websocket_origin: Optional[str] = None, threaded: bool = False, verbose: bool = True, open: bool = True, location: bool | 'Location' = True, **kwargs) → StoppableThread' | 'Server

Starts a Bokeh server and displays the Viewable in a new tab.

Parameters:

• title (str | None) – A string title to give the Document (if served as an app)

• port (int (optional, default=0)) – Allows specifying a specific port

• address (str) – The address the server should listen on for HTTP requests.

• websocket_origin (str or list(str) (optional)) – A list of hosts that can connect to the websocket. This is typically required when embedding a server app in an external web site. If None, “localhost” is used.

• threaded (boolean (optional, default=False)) – Whether to launch the Server on a separate thread, allowing interactive use.

• verbose (boolean (optional, default=True)) – Whether to print the address and port

• open (boolean (optional, default=True)) – Whether to open the server in a new browser tab

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

Returns:

server – Returns the Bokeh server instance or the thread the server was launched on (if threaded=True)

Return type:

bokeh.server.Server or panel.io.server.StoppableThread

class panel.param.ReactiveExpr(object=None, **params)

Bases: PaneBase

ReactiveExpr generates a UI for param.rx objects by rendering the widgets and outputs.

Parameters inherited from:

panel.viewable.Layoutable: align, aspect_ratio, css_classes, design, height, min_width, min_height, max_width, max_height, styles, stylesheets, tags, width, width_policy, height_policy, sizing_mode, visible

panel.viewable.Viewable: loading

panel.pane.base.PaneBase: margin, default_layout

object = param.Parameter(allow_None=True, allow_refs=False, label=’Object’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x17fc29950>)

The object being wrapped, which will be converted to a Bokeh model.

center = param.Boolean(allow_refs=False, default=False, label=’Center’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x17fc2a550>)

Whether to center the output.

show_widgets = param.Boolean(allow_refs=False, default=True, label=’Show widgets’, nested_refs=False, rx=<param.reactive.reactive_ops object at 0x17fc2ab10>)

Whether to display the widget inputs.

widget_layout = param.Selector(allow_refs=False, constant=True, default=<class ‘panel.layout.base.WidgetBox’>, label=’Widget layout’, names={}, nested_refs=False, objects=[<class ‘panel.layout.base.WidgetBox’>, <class ‘panel.layout.base.Row’>, <class ‘panel.layout.base.Column’>], rx=<param.reactive.reactive_ops object at 0x17faea110>)

The layout object to display the widgets in.

widget_location = param.Selector(allow_refs=False, default=’left_top’, label=’Widget location’, names={}, nested_refs=False, objects=[‘left’, ‘right’, ‘top’, ‘bottom’, ‘top_left’, ‘top_right’, ‘bottom_left’, ‘bottom_right’, ‘left_top’, ‘right_top’, ‘right_bottom’], rx=<param.reactive.reactive_ops object at 0x17fc2a6d0>)

The location of the widgets relative to the output of the reactive expression.

classmethod applies(object)

Returns boolean or float indicating whether the Pane can render the object.

If the priority of the pane is set to None, this method may also be used to define a float priority depending on the object being rendered.

clone(object: Optional[Any] = None, **params) → T

Makes a copy of the Pane sharing the same parameters.

Parameters:

• object (Optional new object to render) –

• params (Keyword arguments override the parameters on the clone.) –

Return type:

Cloned Pane object

controls(parameters: List[str] = [], jslink: bool = True, **kwargs) → Panel

Creates a set of widgets which allow manipulating the parameters on this instance. By default all parameters which support linking are exposed, but an explicit list of parameters can be provided.

Parameters:

• parameters (list(str)) – An explicit list of parameters to return controls for.

• jslink (bool) – Whether to use jslinks instead of Python based links. This does not allow using all types of parameters.

• kwargs (dict) – Additional kwargs to pass to the Param pane(s) used to generate the controls widgets.

Return type:

A layout of the controls

default_layout

alias of Row

embed(max_states: int = 1000, max_opts: int = 3, json: bool = False, json_prefix: str = '', save_path: str = './', load_path: Optional[str] = None, progress: bool = False, states={}) → None

Renders a static version of a panel in a notebook by evaluating the set of states defined by the widgets in the model. Note this will only work well for simple apps with a relatively small state space.

Parameters:

• max_states (int) – The maximum number of states to embed

• max_opts (int) – The maximum number of states for a single widget

• json (boolean (default=True)) – Whether to export the data to json files

• json_prefix (str (default='')) – Prefix for JSON filename

• save_path (str (default='./')) – The path to save json files to

• load_path (str (default=None)) – The path or URL the json files will be loaded from.

• progress (boolean (default=False)) – Whether to report progress

• states (dict (default={})) – A dictionary specifying the widget values to embed for each widget

classmethod get_pane_type(obj: Any, **kwargs) → Type[PaneBase]

Returns the applicable Pane type given an object by resolving the precedence of all types whose applies method declares that the object is supported.

Parameters:

(object) (obj) –

Return type:

The applicable Pane type with the highest precedence.

get_root(doc: Optional[Document] = None, comm: Comm | None = None, preprocess: bool = True) → Model

Returns the root model and applies pre-processing hooks

Parameters:

• doc (bokeh.document.Document) – Optional Bokeh document the bokeh model will be attached to.

• comm (pyviz_comms.Comm) – Optional pyviz_comms when working in notebook

• preprocess (bool (default=True)) – Whether to run preprocessing hooks

Return type:

Returns the bokeh model corresponding to this panel object

jscallback(args: Dict[str, Any] = {}, **callbacks: str) → Callback

Allows defining a JS callback to be triggered when a property changes on the source object. The keyword arguments define the properties that trigger a callback and the JS code that gets executed.

Parameters:

• args (dict) – A mapping of objects to make available to the JS callback

• **callbacks (dict) – A mapping between properties on the source model and the code to execute when that property changes

Returns:

callback – The Callback which can be used to disable the callback.

Return type:

Callback

jslink(target: JSLinkTarget, code: Dict[str, str] = None, args: Optional[Dict] = None, bidirectional: bool = False, **links: str) → Link

Links properties on the this Reactive object to those on the target Reactive object in 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 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

• **links (dict) – A mapping between properties on the source model and the target model property to link it to.

Returns:

link – The GenericLink which can be used unlink the widget and the target model.

Return type:

GenericLink

link(target: Parameterized, callbacks: Optional[Dict[str, Union[str, Callable]]] = None, bidirectional: bool = False, **links: str) → Watcher

Links the parameters on this Reactive object to attributes on the target Parameterized object.

Supports two modes, either specify a mapping between the source and target object parameters as keywords or provide a dictionary of callbacks which maps from the source parameter to a callback which is triggered when the parameter changes.

Parameters:

• target (param.Parameterized) – The target object of the link.

• callbacks (dict | None) – Maps from a parameter in the source object to a callback.

• bidirectional (bool) – Whether to link source and target bi-directionally

• **links (dict) – Maps between parameters on this object to the parameters on the supplied object.

save(filename: str | os.PathLike | IO, title: Optional[str] = None, resources: bokeh.resources.Resources | None = None, template: str | jinja2.environment.Template | None = None, template_variables: Dict[str, Any] = {}, embed: bool = False, max_states: int = 1000, max_opts: int = 3, embed_json: bool = False, json_prefix: str = '', save_path: str = './', load_path: Optional[str] = None, progress: bool = True, embed_states: Dict[Any, Any] = {}, as_png: bool | None = None, **kwargs) → None

Saves Panel objects to file.

Parameters:

• filename (str or file-like object) – Filename to save the plot to

• title (string) – Optional title for the plot

• resources (bokeh resources) – One of the valid bokeh.resources (e.g. CDN or INLINE)

• template – passed to underlying io.save

• template_variables – passed to underlying io.save

• embed (bool) – Whether the state space should be embedded in the saved file.

• max_states (int) – The maximum number of states to embed

• max_opts (int) – The maximum number of states for a single widget

• embed_json (boolean (default=True)) – Whether to export the data to json files

• json_prefix (str (default='')) – Prefix for the auto-generated json directory

• save_path (str (default='./')) – The path to save json files to

• load_path (str (default=None)) – The path or URL the json files will be loaded from.

• progress (boolean (default=True)) – Whether to report progress

• embed_states (dict (default={})) – A dictionary specifying the widget values to embed for each widget

• as_png (boolean (default=None)) – To save as a .png. If None save_png will be true if filename is string and ends with png.

select(selector: Optional[Union[type, Callable[[Viewable], bool]]] = None) → List[Viewable]

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

Return type:

list(Viewable)

servable(title: Optional[str] = None, location: bool | 'Location' = True, area: str = 'main', target: Optional[str] = None) → ServableMixin

Serves the object or adds it to the configured pn.state.template if in a panel serve context, writes to the DOM if in a pyodide context and returns the Panel object to allow it to display itself in a notebook context.

Parameters:

• title (str) – A string title to give the Document (if served as an app)

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

• area (str (deprecated)) – The area of a template to add the component too. Only has an effect if pn.config.template has been set.

• target (str) – Target area to write to. If a template has been configured on pn.config.template this refers to the target area in the template while in pyodide this refers to the ID of the DOM node to write to.

Return type:

The Panel object itself

server_doc(doc: Optional[Document] = None, title: Optional[str] = None, location: bool | 'Location' = True) → Document

Returns a serveable bokeh Document with the panel attached

Parameters:

• doc (bokeh.Document (optional)) – The bokeh Document to attach the panel to as a root, defaults to bokeh.io.curdoc()

• title (str) – A string title to give the Document

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

Returns:

doc – The bokeh document the panel was attached to

Return type:

bokeh.Document

show(title: Optional[str] = None, port: int = 0, address: Optional[str] = None, websocket_origin: Optional[str] = None, threaded: bool = False, verbose: bool = True, open: bool = True, location: bool | 'Location' = True, **kwargs) → StoppableThread' | 'Server

Starts a Bokeh server and displays the Viewable in a new tab.

Parameters:

• title (str | None) – A string title to give the Document (if served as an app)

• port (int (optional, default=0)) – Allows specifying a specific port

• address (str) – The address the server should listen on for HTTP requests.

• websocket_origin (str or list(str) (optional)) – A list of hosts that can connect to the websocket. This is typically required when embedding a server app in an external web site. If None, “localhost” is used.

• threaded (boolean (optional, default=False)) – Whether to launch the Server on a separate thread, allowing interactive use.

• verbose (boolean (optional, default=True)) – Whether to print the address and port

• open (boolean (optional, default=True)) – Whether to open the server in a new browser tab

• location (boolean or panel.io.location.Location) – Whether to create a Location component to observe and set the URL location.

Returns:

server – Returns the Bokeh server instance or the thread the server was launched on (if threaded=True)

Return type:

bokeh.server.Server or panel.io.server.StoppableThread

widget_layout

alias of WidgetBox

panel.param.set_values(*parameterizeds, **param_values)

Temporarily sets parameter values to the specified values on all supplied Parameterized objects.

Parameters:

• parameterizeds (tuple(param.Parameterized)) – Any number of parameterized objects.

• param_values (dict) – A dictionary of parameter names and temporary values.