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<html><head><title>Python: module weakref</title>
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<td valign=bottom> <br>
<font color="#ffffff" face="helvetica, arial"> <br><big><big><strong>weakref</strong></big></big></font></td
><td align=right valign=bottom
><font color="#ffffff" face="helvetica, arial"><a href=".">index</a><br><a href="file:/usr/lib/python2.7/weakref.py">/usr/lib/python2.7/weakref.py</a></font></td></tr></table>
<p><tt>Weak reference support for Python.<br>
<br>
This module is an implementation of <a href="http://www.python.org/dev/peps/pep-0205/">PEP 205</a>:<br>
<br>
<a href="http://www.python.org/dev/peps/pep-0205/">http://www.python.org/dev/peps/pep-0205/</a></tt></p>
<p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#aa55cc">
<td colspan=3 valign=bottom> <br>
<font color="#fffff" face="helvetica, arial"><big><strong>Modules</strong></big></font></td></tr>
<tr><td bgcolor="#aa55cc"><tt> </tt></td><td> </td>
<td width="100%"><table width="100%" summary="list"><tr><td width="25%" valign=top><a href="UserDict.html">UserDict</a><br>
</td><td width="25%" valign=top></td><td width="25%" valign=top></td><td width="25%" valign=top></td></tr></table></td></tr></table><p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ee77aa">
<td colspan=3 valign=bottom> <br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Classes</strong></big></font></td></tr>
<tr><td bgcolor="#ee77aa"><tt> </tt></td><td> </td>
<td width="100%"><dl>
<dt><font face="helvetica, arial"><a href="UserDict.html#UserDict">UserDict</a>
</font></dt><dd>
<dl>
<dt><font face="helvetica, arial"><a href="weakref.html#WeakKeyDictionary">WeakKeyDictionary</a>
</font></dt><dt><font face="helvetica, arial"><a href="weakref.html#WeakValueDictionary">WeakValueDictionary</a>
</font></dt></dl>
</dd>
<dt><font face="helvetica, arial">__builtin__.weakref(<a href="__builtin__.html#object">object</a>)
</font></dt><dd>
<dl>
<dt><font face="helvetica, arial"><a href="weakref.html#KeyedRef">KeyedRef</a>
</font></dt></dl>
</dd>
</dl>
<p>
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<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom> <br>
<font color="#000000" face="helvetica, arial"><a name="KeyedRef">class <strong>KeyedRef</strong></a>(__builtin__.weakref)</font></td></tr>
<tr bgcolor="#ffc8d8"><td rowspan=2><tt> </tt></td>
<td colspan=2><tt>Specialized reference that includes a key corresponding to the value.<br>
<br>
This is used in the <a href="#WeakValueDictionary">WeakValueDictionary</a> to avoid having to create<br>
a function object for each key stored in the mapping. A shared<br>
callback object can use the 'key' attribute of a <a href="#KeyedRef">KeyedRef</a> instead<br>
of getting a reference to the key from an enclosing scope.<br> </tt></td></tr>
<tr><td> </td>
<td width="100%"><dl><dt>Method resolution order:</dt>
<dd><a href="weakref.html#KeyedRef">KeyedRef</a></dd>
<dd>__builtin__.weakref</dd>
<dd><a href="__builtin__.html#object">object</a></dd>
</dl>
<hr>
Methods defined here:<br>
<dl><dt><a name="KeyedRef-__init__"><strong>__init__</strong></a>(self, ob, callback, key)</dt></dl>
<hr>
Static methods defined here:<br>
<dl><dt><a name="KeyedRef-__new__"><strong>__new__</strong></a>(type, ob, callback, key)</dt></dl>
<hr>
Data descriptors defined here:<br>
<dl><dt><strong>key</strong></dt>
</dl>
<hr>
Methods inherited from __builtin__.weakref:<br>
<dl><dt><a name="KeyedRef-__call__"><strong>__call__</strong></a>(...)</dt><dd><tt>x.<a href="#KeyedRef-__call__">__call__</a>(...) <==> x(...)</tt></dd></dl>
<dl><dt><a name="KeyedRef-__eq__"><strong>__eq__</strong></a>(...)</dt><dd><tt>x.<a href="#KeyedRef-__eq__">__eq__</a>(y) <==> x==y</tt></dd></dl>
<dl><dt><a name="KeyedRef-__ge__"><strong>__ge__</strong></a>(...)</dt><dd><tt>x.<a href="#KeyedRef-__ge__">__ge__</a>(y) <==> x>=y</tt></dd></dl>
<dl><dt><a name="KeyedRef-__gt__"><strong>__gt__</strong></a>(...)</dt><dd><tt>x.<a href="#KeyedRef-__gt__">__gt__</a>(y) <==> x>y</tt></dd></dl>
<dl><dt><a name="KeyedRef-__hash__"><strong>__hash__</strong></a>(...)</dt><dd><tt>x.<a href="#KeyedRef-__hash__">__hash__</a>() <==> hash(x)</tt></dd></dl>
<dl><dt><a name="KeyedRef-__le__"><strong>__le__</strong></a>(...)</dt><dd><tt>x.<a href="#KeyedRef-__le__">__le__</a>(y) <==> x<=y</tt></dd></dl>
<dl><dt><a name="KeyedRef-__lt__"><strong>__lt__</strong></a>(...)</dt><dd><tt>x.<a href="#KeyedRef-__lt__">__lt__</a>(y) <==> x<y</tt></dd></dl>
<dl><dt><a name="KeyedRef-__ne__"><strong>__ne__</strong></a>(...)</dt><dd><tt>x.<a href="#KeyedRef-__ne__">__ne__</a>(y) <==> x!=y</tt></dd></dl>
<dl><dt><a name="KeyedRef-__repr__"><strong>__repr__</strong></a>(...)</dt><dd><tt>x.<a href="#KeyedRef-__repr__">__repr__</a>() <==> repr(x)</tt></dd></dl>
</td></tr></table> <p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom> <br>
<font color="#000000" face="helvetica, arial"><a name="WeakKeyDictionary">class <strong>WeakKeyDictionary</strong></a>(<a href="UserDict.html#UserDict">UserDict</a>)</font></td></tr>
<tr bgcolor="#ffc8d8"><td rowspan=2><tt> </tt></td>
<td colspan=2><tt>Mapping class that references keys weakly.<br>
<br>
Entries in the dictionary will be discarded when there is no<br>
longer a strong reference to the key. This can be used to<br>
associate additional data with an object owned by other parts of<br>
an application without adding attributes to those objects. This<br>
can be especially useful with objects that override attribute<br>
accesses.<br> </tt></td></tr>
<tr><td> </td>
<td width="100%">Methods defined here:<br>
<dl><dt><a name="WeakKeyDictionary-__contains__"><strong>__contains__</strong></a>(self, key)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-__copy__"><strong>__copy__</strong></a> = <a href="#WeakKeyDictionary-copy">copy</a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-__deepcopy__"><strong>__deepcopy__</strong></a>(self, memo)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-__delitem__"><strong>__delitem__</strong></a>(self, key)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-__getitem__"><strong>__getitem__</strong></a>(self, key)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-__init__"><strong>__init__</strong></a>(self, dict<font color="#909090">=None</font>)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-__iter__"><strong>__iter__</strong></a> = <a href="#WeakKeyDictionary-iterkeys">iterkeys</a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-__repr__"><strong>__repr__</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-__setitem__"><strong>__setitem__</strong></a>(self, key, value)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-copy"><strong>copy</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-get"><strong>get</strong></a>(self, key, default<font color="#909090">=None</font>)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-has_key"><strong>has_key</strong></a>(self, key)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-items"><strong>items</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-iteritems"><strong>iteritems</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-iterkeyrefs"><strong>iterkeyrefs</strong></a>(self)</dt><dd><tt>Return an iterator that yields the weak references to the keys.<br>
<br>
The references are not guaranteed to be 'live' at the time<br>
they are used, so the result of calling the references needs<br>
to be checked before being used. This can be used to avoid<br>
creating references that will cause the garbage collector to<br>
keep the keys around longer than needed.</tt></dd></dl>
<dl><dt><a name="WeakKeyDictionary-iterkeys"><strong>iterkeys</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-itervalues"><strong>itervalues</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-keyrefs"><strong>keyrefs</strong></a>(self)</dt><dd><tt>Return a list of weak references to the keys.<br>
<br>
The references are not guaranteed to be 'live' at the time<br>
they are used, so the result of calling the references needs<br>
to be checked before being used. This can be used to avoid<br>
creating references that will cause the garbage collector to<br>
keep the keys around longer than needed.</tt></dd></dl>
<dl><dt><a name="WeakKeyDictionary-keys"><strong>keys</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-pop"><strong>pop</strong></a>(self, key, *args)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-popitem"><strong>popitem</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-setdefault"><strong>setdefault</strong></a>(self, key, default<font color="#909090">=None</font>)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-update"><strong>update</strong></a>(self, dict<font color="#909090">=None</font>, **kwargs)</dt></dl>
<hr>
Methods inherited from <a href="UserDict.html#UserDict">UserDict</a>:<br>
<dl><dt><a name="WeakKeyDictionary-__cmp__"><strong>__cmp__</strong></a>(self, dict)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-__len__"><strong>__len__</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-clear"><strong>clear</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakKeyDictionary-values"><strong>values</strong></a>(self)</dt></dl>
<hr>
Class methods inherited from <a href="UserDict.html#UserDict">UserDict</a>:<br>
<dl><dt><a name="WeakKeyDictionary-fromkeys"><strong>fromkeys</strong></a>(cls, iterable, value<font color="#909090">=None</font>)<font color="#909090"><font face="helvetica, arial"> from __builtin__.classobj</font></font></dt></dl>
<hr>
Data and other attributes inherited from <a href="UserDict.html#UserDict">UserDict</a>:<br>
<dl><dt><strong>__hash__</strong> = None</dl>
</td></tr></table> <p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom> <br>
<font color="#000000" face="helvetica, arial"><a name="WeakValueDictionary">class <strong>WeakValueDictionary</strong></a>(<a href="UserDict.html#UserDict">UserDict</a>)</font></td></tr>
<tr bgcolor="#ffc8d8"><td rowspan=2><tt> </tt></td>
<td colspan=2><tt>Mapping class that references values weakly.<br>
<br>
Entries in the dictionary will be discarded when no strong<br>
reference to the value exists anymore<br> </tt></td></tr>
<tr><td> </td>
<td width="100%">Methods defined here:<br>
<dl><dt><a name="WeakValueDictionary-__contains__"><strong>__contains__</strong></a>(self, key)</dt></dl>
<dl><dt><a name="WeakValueDictionary-__copy__"><strong>__copy__</strong></a> = <a href="#WeakValueDictionary-copy">copy</a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-__deepcopy__"><strong>__deepcopy__</strong></a>(self, memo)</dt></dl>
<dl><dt><a name="WeakValueDictionary-__delitem__"><strong>__delitem__</strong></a>(self, key)</dt></dl>
<dl><dt><a name="WeakValueDictionary-__getitem__"><strong>__getitem__</strong></a>(self, key)</dt></dl>
<dl><dt><a name="WeakValueDictionary-__init__"><strong>__init__</strong></a>(*args, **kw)</dt></dl>
<dl><dt><a name="WeakValueDictionary-__iter__"><strong>__iter__</strong></a> = <a href="#WeakValueDictionary-iterkeys">iterkeys</a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-__repr__"><strong>__repr__</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-__setitem__"><strong>__setitem__</strong></a>(self, key, value)</dt></dl>
<dl><dt><a name="WeakValueDictionary-clear"><strong>clear</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-copy"><strong>copy</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-get"><strong>get</strong></a>(self, key, default<font color="#909090">=None</font>)</dt></dl>
<dl><dt><a name="WeakValueDictionary-has_key"><strong>has_key</strong></a>(self, key)</dt></dl>
<dl><dt><a name="WeakValueDictionary-items"><strong>items</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-iteritems"><strong>iteritems</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-iterkeys"><strong>iterkeys</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-itervaluerefs"><strong>itervaluerefs</strong></a>(self)</dt><dd><tt>Return an iterator that yields the weak references to the values.<br>
<br>
The references are not guaranteed to be 'live' at the time<br>
they are used, so the result of calling the references needs<br>
to be checked before being used. This can be used to avoid<br>
creating references that will cause the garbage collector to<br>
keep the values around longer than needed.</tt></dd></dl>
<dl><dt><a name="WeakValueDictionary-itervalues"><strong>itervalues</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-pop"><strong>pop</strong></a>(self, key, *args)</dt></dl>
<dl><dt><a name="WeakValueDictionary-popitem"><strong>popitem</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-setdefault"><strong>setdefault</strong></a>(self, key, default<font color="#909090">=None</font>)</dt></dl>
<dl><dt><a name="WeakValueDictionary-update"><strong>update</strong></a>(*args, **kwargs)</dt></dl>
<dl><dt><a name="WeakValueDictionary-valuerefs"><strong>valuerefs</strong></a>(self)</dt><dd><tt>Return a list of weak references to the values.<br>
<br>
The references are not guaranteed to be 'live' at the time<br>
they are used, so the result of calling the references needs<br>
to be checked before being used. This can be used to avoid<br>
creating references that will cause the garbage collector to<br>
keep the values around longer than needed.</tt></dd></dl>
<dl><dt><a name="WeakValueDictionary-values"><strong>values</strong></a>(self)</dt></dl>
<hr>
Methods inherited from <a href="UserDict.html#UserDict">UserDict</a>:<br>
<dl><dt><a name="WeakValueDictionary-__cmp__"><strong>__cmp__</strong></a>(self, dict)</dt></dl>
<dl><dt><a name="WeakValueDictionary-__len__"><strong>__len__</strong></a>(self)</dt></dl>
<dl><dt><a name="WeakValueDictionary-keys"><strong>keys</strong></a>(self)</dt></dl>
<hr>
Class methods inherited from <a href="UserDict.html#UserDict">UserDict</a>:<br>
<dl><dt><a name="WeakValueDictionary-fromkeys"><strong>fromkeys</strong></a>(cls, iterable, value<font color="#909090">=None</font>)<font color="#909090"><font face="helvetica, arial"> from __builtin__.classobj</font></font></dt></dl>
<hr>
Data and other attributes inherited from <a href="UserDict.html#UserDict">UserDict</a>:<br>
<dl><dt><strong>__hash__</strong> = None</dl>
</td></tr></table></td></tr></table><p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#eeaa77">
<td colspan=3 valign=bottom> <br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Functions</strong></big></font></td></tr>
<tr><td bgcolor="#eeaa77"><tt> </tt></td><td> </td>
<td width="100%"><dl><dt><a name="-getweakrefcount"><strong>getweakrefcount</strong></a>(...)</dt><dd><tt><a href="#-getweakrefcount">getweakrefcount</a>(object) -- return the number of weak references<br>
to 'object'.</tt></dd></dl>
<dl><dt><a name="-getweakrefs"><strong>getweakrefs</strong></a>(...)</dt><dd><tt><a href="#-getweakrefs">getweakrefs</a>(object) -- return a list of all weak reference objects<br>
that point to 'object'.</tt></dd></dl>
<dl><dt><a name="-proxy"><strong>proxy</strong></a>(...)</dt><dd><tt><a href="#-proxy">proxy</a>(object[, callback]) -- create a proxy object that weakly<br>
references 'object'. 'callback', if given, is called with a<br>
reference to the proxy when 'object' is about to be finalized.</tt></dd></dl>
</td></tr></table><p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#55aa55">
<td colspan=3 valign=bottom> <br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Data</strong></big></font></td></tr>
<tr><td bgcolor="#55aa55"><tt> </tt></td><td> </td>
<td width="100%"><strong>ProxyTypes</strong> = (<type 'weakproxy'>, <type 'weakcallableproxy'>)<br>
<strong>__all__</strong> = ['ref', 'proxy', 'getweakrefcount', 'getweakrefs', 'WeakKeyDictionary', 'ReferenceError', 'ReferenceType', 'ProxyType', 'CallableProxyType', 'ProxyTypes', 'WeakValueDictionary', 'WeakSet']<br>
<strong>__file__</strong> = '/usr/lib/python2.7/weakref.pyc'<br>
<strong>__name__</strong> = 'weakref'</td></tr></table>
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