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"""
Assigning to Existing Classes
+++++++++++++++++++++++++++++
Custom properties can be added to any subclass of an :class:`ID`,
:class:`Bone` and :class:`PoseBone`.
These properties can be animated, accessed by the user interface and Python
like Blender's existing properties.
.. warning::
Access to these properties might happen in threaded context, on a per-data-block level.
This has to be carefully considered when using accessors or update callbacks.
Typically, these callbacks should not affect any other data that the one owned by their data-block.
When accessing external non-Blender data, thread safety mechanisms should be considered.
"""
import bpy
# Assign a custom property to an existing type.
bpy.types.Material.custom_float = bpy.props.FloatProperty(name="Test Property")
# Test the property is there.
bpy.data.materials[0].custom_float = 5.0
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