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This module is an implementation of PEP 205:
http://www.python.org/dev/peps/pep-0205/
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Entries in the dictionary will be discarded when no strong
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R c B s& e Z d Z d Z d „ Z d „ Z RS( s[ Specialized reference that includes a key corresponding to the value.
This is used in the WeakValueDictionary to avoid having to create
a function object for each key stored in the mapping. A shared
callback object can use the 'key' attribute of a KeyedRef instead
of getting a reference to the key from an enclosing scope.
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d „ Z d „ Z d
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Entries in the dictionary will be discarded when there is no
longer a strong reference to the key. This can be used to
associate additional data with an object owned by other parts of
an application without adding attributes to those objects. This
can be especially useful with objects that override attribute
accesses.
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