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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
reference to the value exists anymore
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The references are not guaranteed to be 'live' at the time
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to be checked before being used. This can be used to avoid
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keep the values around longer than needed.
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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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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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c c s6 t | � �$ x | j j � D] } | Vq WWd QXd S( s� Return an iterator that yields the weak references to the keys.
The references are not guaranteed to be 'live' at the time
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to be checked before being used. This can be used to avoid
creating references that will cause the garbage collector to
keep the keys around longer than needed.
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The references are not guaranteed to be 'live' at the time
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creating references that will cause the garbage collector to
keep the keys around longer than needed.
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