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z�Mapping class that references values weakly.
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t | j � S)az Return a list of weak references to the keys.
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� Z e d d � � Z e d d � � Z e j d d � � Z d d � Z e d d � � Z e d d � � Z d S)r a Class for finalization of weakrefable objects
finalize(obj, func, *args, **kwargs) returns a callable finalizer
object which will be called when obj is garbage collected. The
first time the finalizer is called it evaluates func(*arg, **kwargs)
and returns the result. After this the finalizer is dead, and
calling it just returns None.
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atexit attribute is true will be run in reverse order of creation.
By default atexit is true.
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