bokeh.core.has_props¶
Provide a base class for objects that can have declarative, typed, serializable properties.
Note
These classes form part of the very low-level machinery that implements the Bokeh model and property system. It is unlikely that any of these classes or their methods will be applicable to any standard usage or to anyone who is not directly developing on Bokeh’s own infrastructure.
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class
HasProps
(**properties)[source]¶ Base class for all class types that have Bokeh properties.
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apply_theme
(property_values)[source]¶ Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the
HasProps
instance should modify it).Parameters: property_values (dict) – theme values to use in place of defaults Returns: None
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classmethod
dataspecs
()[source]¶ Collect the names of all
DataSpec
properties on this class.This method always traverses the class hierarchy and includes properties defined on any parent classes.
Returns: names of DataSpec
propertiesReturn type: set[str]
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classmethod
dataspecs_with_props
()[source]¶ Collect a dict mapping the names of all
DataSpec
properties on this class to the associated properties.This method always traverses the class hierarchy and includes properties defined on any parent classes.
Returns: mapping of names and DataSpec
propertiesReturn type: dict[str, DataSpec]
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equals
(other)[source]¶ Structural equality of models.
Parameters: other (HasProps) – the other instance to compare to Returns: True, if properties are structurally equal, otherwise False
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classmethod
lookup
(name)[source]¶ Find the
PropertyDescriptor
for a Bokeh property on a class, given the property name.Parameters: name (str) – name of the property to search for Returns: descriptor for property named name
Return type: PropertyDescriptor
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classmethod
properties
(with_bases=True)[source]¶ Collect the names of properties on this class.
This method optionally traverses the class hierarchy and includes properties defined on any parent classes.
Parameters: with_bases (bool, optional) – Whether to include properties defined on parent classes in the results. (default: True) Returns: property names Return type: set[str]
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classmethod
properties_containers
()[source]¶ Collect the names of all container properties on this class.
This method always traverses the class hierarchy and includes properties defined on any parent classes.
Returns: names of container properties Return type: set[str]
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classmethod
properties_with_refs
()[source]¶ Collect the names of all properties on this class that also have references.
This method always traverses the class hierarchy and includes properties defined on any parent classes.
Returns: names of properties that have references Return type: set[str]
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properties_with_values
(include_defaults=True)[source]¶ Collect a dict mapping property names to their values.
This method always traverses the class hierarchy and includes properties defined on any parent classes.
Non-serializable properties are skipped and property values are in “serialized” format which may be slightly different from the values you would normally read from the properties; the intent of this method is to return the information needed to losslessly reconstitute the object instance.
Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True) Returns: mapping from property names to their values Return type: dict
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query_properties_with_values
(query, include_defaults=True)[source]¶ Query the properties values of
HasProps
instances with a predicate.Parameters: - query (callable) – A callable that accepts property descriptors and returns True or False
- include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)
Returns: mapping of property names and values for matching properties
Return type:
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set_from_json
(name, json, models=None, setter=None)[source]¶ Set a property value on this object from JSON.
Parameters: - name – (str) : name of the attribute to set
- json – (JSON-value) : value to set to the attribute to
- models (dict or None, optional) –
Mapping of model ids to models (default: None)
This is needed in cases where the attributes to update also have values that have references.
- setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.
In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.
Returns: None
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themed_values
()[source]¶ Get any theme-provided overrides.
Results are returned as a dict from property name to value, or
None
if no theme overrides any values for this instance.Returns: dict or None
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update
(**kwargs)[source]¶ Updates the object’s properties from the given keyword arguments.
Returns: None Examples
The following are equivalent:
from bokeh.models import Range1d r = Range1d # set properties individually: r.start = 10 r.end = 20 # update properties together: r.update(start=10, end=20)
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update_from_json
(json_attributes, models=None, setter=None)[source]¶ Updates the object’s properties from a JSON attributes dictionary.
Parameters: - json_attributes – (JSON-dict) : attributes and values to update
- models (dict or None, optional) –
Mapping of model ids to models (default: None)
This is needed in cases where the attributes to update also have values that have references.
- setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.
In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.
Returns: None
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class
MetaHasProps
(class_name, bases, nmspc)[source]¶ Specialize the construction of
HasProps
classes.This class is a metaclass for
HasProps
that is responsible for creating and adding thePropertyDescriptor
instances that delegate validation and serialization toProperty
attributes.
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accumulate_dict_from_superclasses
(cls, propname)[source]¶ Traverse the class hierarchy and accumulate the special dicts
MetaHasProps
stores on classes:Parameters: name (str) – name of the special attribute to collect.
Typically meaningful values are:
__dataspecs__
,__overridden_defaults__
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accumulate_from_superclasses
(cls, propname)[source]¶ Traverse the class hierarchy and accumulate the special sets of names
MetaHasProps
stores on classes:Parameters: name (str) – name of the special attribute to collect.
Typically meaningful values are:
__container_props__
,__properties__
,__properties_with_refs__