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e j f d � � YZ d S( s{ Weak reference support for Python.
This module is an implementation of PEP 205:
http://www.python.org/dev/peps/pep-0205/
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� Z d � Z d � Z e Z d � Z d � Z d � Z d � Z d d � Z d � Z d � Z d � Z RS( s� Mapping class that references values weakly.
Entries in the dictionary will be discarded when no strong
reference to the value exists anymore
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