U õÕ/e‚ ã@sVdZddlmZddlZe e¡ZddlmZm Z dZ e dƒZ Gdd„dee ƒZ dS) zÐ Provide the ``Override`` class, for overriding base class property attributes. .. note:: This class should normally be imported from ``bokeh.core.properties`` instead of directly from this module. é)Ú annotationsN)ÚGenericÚTypeVar)ÚOverrideÚTc@s2eZdZUdZded<ded<dddœdd „Zd S) ra  Override attributes of Bokeh property in derived Models. When subclassing a Bokeh Model, it may be desirable to change some of the attributes of the property itself, from those on the base class. This is accomplished using the ``Override`` class. Currently, ``Override`` can only be use to override the ``default`` value for the property. Keyword Args: default (obj) : a default value for this property on a subclass Example: Consider the following class definitions: .. code-block:: python from bokeh.model import Model from bokeh.properties import Int, Override class Parent(Model): foo = Int(default=10) class Child(Parent): foo = Override(default=20) The parent class has an integer property ``foo`` with default value 10. The child class uses the following code: .. code-block:: python foo = Override(default=20) to specify that the default value for the ``foo`` property should be 20 on instances of the child class: .. code-block:: python >>> p = Parent() >>> p.foo 10 >>> c = Child() >>> c.foo 20 ÚboolÚdefault_overriddenrÚdefaultÚNone)r ÚreturncCsd|_||_dS)NT)rr )Úselfr ©r ú@/tmp/pip-unpacked-wheel-f5fndrjf/bokeh/core/property/override.pyÚ__init__bszOverride.__init__N)Ú__name__Ú __module__Ú __qualname__Ú__doc__Ú__annotations__rr r r rr-s 1r) rÚ __future__rÚloggingÚ getLoggerrÚlogÚtypingrrÚ__all__rrr r r rÚs