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SF #1479988: add methods to allow access to weakrefs for the

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weakref.WeakKeyDictionary and weakref.WeakValueDictionary
This commit is contained in:
Fred Drake 2006-05-02 06:53:59 +00:00
parent a6d01cec3f
commit 017e68c413
3 changed files with 125 additions and 0 deletions
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48
Lib/weakref.py
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@ -118,6 +118,18 @@ class WeakValueDictionary(UserDict.UserDict):
def __iter__(self):
return self.data.iterkeys()
def itervaluerefs(self):
"""Return an iterator that yields the weak references to the values.
The references are not guaranteed to be 'live' at the time
they are used, so the result of calling the references needs
to be checked before being used. This can be used to avoid
creating references that will cause the garbage collector to
keep the values around longer than needed.
"""
return self.data.itervalues()
def itervalues(self):
for wr in self.data.itervalues():
obj = wr()
@ -162,6 +174,18 @@ class WeakValueDictionary(UserDict.UserDict):
if len(kwargs):
self.update(kwargs)
def valuerefs(self):
"""Return a list of weak references to the values.
The references are not guaranteed to be 'live' at the time
they are used, so the result of calling the references needs
to be checked before being used. This can be used to avoid
creating references that will cause the garbage collector to
keep the values around longer than needed.
"""
return self.data.values()
def values(self):
L = []
for wr in self.data.values():
@ -263,6 +287,18 @@ class WeakKeyDictionary(UserDict.UserDict):
if key is not None:
yield key, value
def iterkeyrefs(self):
"""Return an iterator that yields the weak references to the keys.
The references are not guaranteed to be 'live' at the time
they are used, so the result of calling the references needs
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.
"""
return self.data.iterkeys()
def iterkeys(self):
for wr in self.data.iterkeys():
obj = wr()
@ -275,6 +311,18 @@ class WeakKeyDictionary(UserDict.UserDict):
def itervalues(self):
return self.data.itervalues()
def keyrefs(self):
"""Return a list of weak references to the keys.
The references are not guaranteed to be 'live' at the time
they are used, so the result of calling the references needs
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.
"""
return self.data.keys()
def keys(self):
L = []
for wr in self.data.keys():