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This module is an implementation of PEP 205:
http://www.python.org/dev/peps/pep-0205/
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A custom `weakref.ref` subclass which simulates a weak reference to
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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 d Z d d d Z d d Z d d Z d d Z e Z d d Z d! d" Z d# d$ Z d% d& Z d d' d( Z d d) d* Z d S)+r a Mapping class that references keys weakly.
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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t | j S)az Return a list of 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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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.
When the program exits any remaining finalizers for which the
atexit attribute is true will be run in reverse order of creation.
By default atexit is true.
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