cpython-lru_cache-weakref: Lib/weakref.py annotate

annotate Lib/weakref.py @ 25838:8540887bcec6 2.2

Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.

author	Guido van Rossum <guido@python.org>
date	Fri, 18 Oct 2002 13:42:21 +0000
parents	5e4eadf1903a
children	bd349999cb08

rev	line source
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	1 """Weak reference support for Python.
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	2
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	3 This module is an implementation of PEP 205:
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	4
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	5 http://python.sourceforge.net/peps/pep-0205.html
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	6 """
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	7
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	8 # Naming convention: Variables named "wr" are weak reference objects;
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	9 # they are called this instead of "ref" to avoid name collisions with
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	10 # the module-global ref() function imported from _weakref.
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	11
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	12 import UserDict
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	13
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	14 from _weakref import \
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	15 getweakrefcount, \
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	16 getweakrefs, \
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	17 ref, \
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	18 proxy, \
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	19 CallableProxyType, \
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	20 ProxyType, \
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	21 ReferenceType
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	22
20281 380d4b4ee602 ReferenceError is now built-in, so pick it up from the right place. Fred Drake <fdrake@acm.org> parents: 20155 diff changeset	23 from exceptions import ReferenceError
380d4b4ee602 ReferenceError is now built-in, so pick it up from the right place. Fred Drake <fdrake@acm.org> parents: 20155 diff changeset	24
380d4b4ee602 ReferenceError is now built-in, so pick it up from the right place. Fred Drake <fdrake@acm.org> parents: 20155 diff changeset	25
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	26 ProxyTypes = (ProxyType, CallableProxyType)
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	27
17386 bbcc9837312e mapping(): Remove this function since it does not add anything to the API. Fred Drake <fdrake@acm.org> parents: 16889 diff changeset	28 __all__ = ["ref", "proxy", "getweakrefcount", "getweakrefs",
16889 0feb63490093 final round of __all__ lists (I hope) - skipped urllib2 because Moshe may be Skip Montanaro <skip@pobox.com> parents: 16884 diff changeset	29 "WeakKeyDictionary", "ReferenceType", "ProxyType",
0feb63490093 final round of __all__ lists (I hope) - skipped urllib2 because Moshe may be Skip Montanaro <skip@pobox.com> parents: 16884 diff changeset	30 "CallableProxyType", "ProxyTypes", "WeakValueDictionary"]
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	31
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	32
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	33 class WeakValueDictionary(UserDict.UserDict):
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	34 """Mapping class that references values weakly.
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	35
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	36 Entries in the dictionary will be discarded when no strong
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	37 reference to the value exists anymore
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	38 """
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	39 # We inherit the constructor without worrying about the input
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	40 # dictionary; since it uses our .update() method, we get the right
16884 1ce751fa67d8 Change WeakDictionary to WeakValueDictionary in a couple more places. Fred Drake <fdrake@acm.org> parents: 16794 diff changeset	41 # checks (if the other dictionary is a WeakValueDictionary,
1ce751fa67d8 Change WeakDictionary to WeakValueDictionary in a couple more places. Fred Drake <fdrake@acm.org> parents: 16794 diff changeset	42 # objects are unwrapped on the way out, and we always wrap on the
1ce751fa67d8 Change WeakDictionary to WeakValueDictionary in a couple more places. Fred Drake <fdrake@acm.org> parents: 16794 diff changeset	43 # way in).
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	44
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	45 def __getitem__(self, key):
18952 e90a658a58d4 Make sure that WeakValueDictionary[] raises KeyError instead of TypeError Fred Drake <fdrake@acm.org> parents: 17650 diff changeset	46 o = self.data[key]()
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	47 if o is None:
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	48 raise KeyError, key
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	49 else:
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	50 return o
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	51
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	52 def __repr__(self):
16884 1ce751fa67d8 Change WeakDictionary to WeakValueDictionary in a couple more places. Fred Drake <fdrake@acm.org> parents: 16794 diff changeset	53 return "<WeakValueDictionary at %s>" % id(self)
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	54
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	55 def __setitem__(self, key, value):
20155 bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	56 self.data[key] = ref(value, self.__makeremove(key))
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	57
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	58 def copy(self):
16884 1ce751fa67d8 Change WeakDictionary to WeakValueDictionary in a couple more places. Fred Drake <fdrake@acm.org> parents: 16794 diff changeset	59 new = WeakValueDictionary()
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	60 for key, wr in self.data.items():
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	61 o = wr()
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	62 if o is not None:
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	63 new[key] = o
16884 1ce751fa67d8 Change WeakDictionary to WeakValueDictionary in a couple more places. Fred Drake <fdrake@acm.org> parents: 16794 diff changeset	64 return new
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	65
17546 da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	66 def get(self, key, default=None):
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	67 try:
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	68 wr = self.data[key]
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	69 except KeyError:
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	70 return default
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	71 else:
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	72 o = wr()
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	73 if o is None:
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	74 # This should only happen
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	75 return default
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	76 else:
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	77 return o
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	78
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	79 def items(self):
16417 901b94656928 WeakDictionary.items(): Do not allow (key,ref) pairs to leak out for Fred Drake <fdrake@acm.org> parents: 16385 diff changeset	80 L = []
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	81 for key, wr in self.data.items():
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	82 o = wr()
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	83 if o is not None:
16417 901b94656928 WeakDictionary.items(): Do not allow (key,ref) pairs to leak out for Fred Drake <fdrake@acm.org> parents: 16385 diff changeset	84 L.append((key, o))
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	85 return L
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	86
17650 7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	87 def iteritems(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	88 return WeakValuedItemIterator(self)
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	89
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	90 def iterkeys(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	91 return self.data.iterkeys()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	92 __iter__ = iterkeys
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	93
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	94 def itervalues(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	95 return WeakValuedValueIterator(self)
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	96
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	97 def popitem(self):
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	98 while 1:
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	99 key, wr = self.data.popitem()
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	100 o = wr()
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	101 if o is not None:
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	102 return key, o
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	103
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	104 def setdefault(self, key, default):
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	105 try:
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	106 wr = self.data[key]
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	107 except KeyError:
20155 bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	108 self.data[key] = ref(default, self.__makeremove(key))
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	109 return default
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	110 else:
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	111 return wr()
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	112
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	113 def update(self, dict):
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	114 d = self.data
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	115 for key, o in dict.items():
20155 bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	116 d[key] = ref(o, self.__makeremove(key))
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	117
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	118 def values(self):
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	119 L = []
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	120 for wr in self.data.values():
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	121 o = wr()
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	122 if o is not None:
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	123 L.append(o)
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	124 return L
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	125
20155 bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	126 def __makeremove(self, key):
bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	127 def remove(o, selfref=ref(self), key=key):
bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	128 self = selfref()
bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	129 if self is not None:
bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	130 del self.data[key]
bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	131 return remove
bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	132
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	133
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	134 class WeakKeyDictionary(UserDict.UserDict):
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	135 """ Mapping class that references keys weakly.
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	136
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	137 Entries in the dictionary will be discarded when there is no
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	138 longer a strong reference to the key. This can be used to
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	139 associate additional data with an object owned by other parts of
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	140 an application without adding attributes to those objects. This
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	141 can be especially useful with objects that override attribute
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	142 accesses.
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	143 """
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	144
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	145 def __init__(self, dict=None):
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	146 self.data = {}
20155 bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	147 def remove(k, selfref=ref(self)):
bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	148 self = selfref()
bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	149 if self is not None:
bbb353d31e25 Clean up circular references in the WeakDictionary classes; this avoids Fred Drake <fdrake@acm.org>* parents: 19763 diff changeset	150 del self.data[k]
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	151 self._remove = remove
24994 5e4eadf1903a backport gvanrossum's checkin of Michael W. Hudson <mwh@python.net> parents: 20902 diff changeset	152 if dict is not None: self.update(dict)
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	153
19763 94d0f2eea047 Add __delitem__() support for WeakKeyDictionary. Fred Drake <fdrake@acm.org> parents: 18952 diff changeset	154 def __delitem__(self, key):
94d0f2eea047 Add __delitem__() support for WeakKeyDictionary. Fred Drake <fdrake@acm.org> parents: 18952 diff changeset	155 for ref in self.data.iterkeys():
94d0f2eea047 Add __delitem__() support for WeakKeyDictionary. Fred Drake <fdrake@acm.org> parents: 18952 diff changeset	156 o = ref()
94d0f2eea047 Add __delitem__() support for WeakKeyDictionary. Fred Drake <fdrake@acm.org> parents: 18952 diff changeset	157 if o == key:
94d0f2eea047 Add __delitem__() support for WeakKeyDictionary. Fred Drake <fdrake@acm.org> parents: 18952 diff changeset	158 del self.data[ref]
94d0f2eea047 Add __delitem__() support for WeakKeyDictionary. Fred Drake <fdrake@acm.org> parents: 18952 diff changeset	159 return
94d0f2eea047 Add __delitem__() support for WeakKeyDictionary. Fred Drake <fdrake@acm.org> parents: 18952 diff changeset	160
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	161 def __getitem__(self, key):
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	162 return self.data[ref(key)]
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	163
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	164 def __repr__(self):
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	165 return "<WeakKeyDictionary at %s>" % id(self)
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	166
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	167 def __setitem__(self, key, value):
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	168 self.data[ref(key, self._remove)] = value
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	169
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	170 def copy(self):
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	171 new = WeakKeyDictionary()
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	172 for key, value in self.data.items():
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	173 o = key()
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	174 if o is not None:
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	175 new[o] = value
16884 1ce751fa67d8 Change WeakDictionary to WeakValueDictionary in a couple more places. Fred Drake <fdrake@acm.org> parents: 16794 diff changeset	176 return new
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	177
17546 da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	178 def get(self, key, default=None):
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	179 return self.data.get(ref(key),default)
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	180
17546 da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	181 def has_key(self, key):
20902 d3f3d21ac04b WeakKeyDictionary.has_key(): If the key being tested is not weakly Fred Drake <fdrake@acm.org> parents: 20281 diff changeset	182 try:
d3f3d21ac04b WeakKeyDictionary.has_key(): If the key being tested is not weakly Fred Drake <fdrake@acm.org> parents: 20281 diff changeset	183 wr = ref(key)
d3f3d21ac04b WeakKeyDictionary.has_key(): If the key being tested is not weakly Fred Drake <fdrake@acm.org> parents: 20281 diff changeset	184 except TypeError:
d3f3d21ac04b WeakKeyDictionary.has_key(): If the key being tested is not weakly Fred Drake <fdrake@acm.org> parents: 20281 diff changeset	185 return 0
d3f3d21ac04b WeakKeyDictionary.has_key(): If the key being tested is not weakly Fred Drake <fdrake@acm.org> parents: 20281 diff changeset	186 return self.data.has_key(wr)
17546 da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	187
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	188 def items(self):
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	189 L = []
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	190 for key, value in self.data.items():
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	191 o = key()
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	192 if o is not None:
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	193 L.append((o, value))
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	194 return L
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	195
17650 7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	196 def iteritems(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	197 return WeakKeyedItemIterator(self)
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	198
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	199 def iterkeys(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	200 return WeakKeyedKeyIterator(self)
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	201 __iter__ = iterkeys
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	202
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	203 def itervalues(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	204 return self.data.itervalues()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	205
17546 da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	206 def keys(self):
da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	207 L = []
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	208 for wr in self.data.keys():
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	209 o = wr()
17546 da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	210 if o is not None:
da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	211 L.append(o)
da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	212 return L
da5eab33147b WeakDictionary.update(): Fix calls to [].append() to only have one Fred Drake <fdrake@acm.org>* parents: 17386 diff changeset	213
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	214 def popitem(self):
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	215 while 1:
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	216 key, value = self.data.popitem()
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	217 o = key()
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	218 if o is not None:
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	219 return o, value
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	220
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	221 def setdefault(self, key, default):
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	222 return self.data.setdefault(ref(key, self._remove),default)
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	223
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	224 def update(self, dict):
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	225 d = self.data
29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	226 for key, value in dict.items():
17591 44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	227 d[ref(key, self._remove)] = value
44a3ac59c268 WeakDictionary: Added docstrings to the classes. Fred Drake <fdrake@acm.org>* parents: 17546 diff changeset	228
16794 29aa832b8787 Patch #403985: Add support for weak-keyed dictionaries Martin v. Löwis <martin@v.loewis.de> parents: 16424 diff changeset	229
17650 7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	230 class BaseIter:
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	231 def __iter__(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	232 return self
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	233
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	234
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	235 class WeakKeyedKeyIterator(BaseIter):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	236 def __init__(self, weakdict):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	237 self._next = weakdict.data.iterkeys().next
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	238
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	239 def next(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	240 while 1:
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	241 wr = self._next()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	242 obj = wr()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	243 if obj is not None:
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	244 return obj
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	245
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	246
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	247 class WeakKeyedItemIterator(BaseIter):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	248 def __init__(self, weakdict):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	249 self._next = weakdict.data.iteritems().next
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	250
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	251 def next(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	252 while 1:
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	253 wr, value = self._next()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	254 key = wr()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	255 if key is not None:
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	256 return key, value
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	257
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	258
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	259 class WeakValuedValueIterator(BaseIter):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	260 def __init__(self, weakdict):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	261 self._next = weakdict.data.itervalues().next
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	262
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	263 def next(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	264 while 1:
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	265 wr = self._next()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	266 obj = wr()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	267 if obj is not None:
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	268 return obj
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	269
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	270
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	271 class WeakValuedItemIterator(BaseIter):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	272 def __init__(self, weakdict):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	273 self._next = weakdict.data.iteritems().next
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	274
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	275 def next(self):
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	276 while 1:
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	277 key, wr = self._next()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	278 value = wr()
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	279 if value is not None:
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	280 return key, value
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	281
7a367ad43f35 Added iterator support to the WeakDictionary classes. Fred Drake <fdrake@acm.org>* parents: 17591 diff changeset	282
16385 1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	283 # no longer needed
1fb6672b20ef PEP 205, Weak References -- initial checkin. Fred Drake <fdrake@acm.org> parents: diff changeset	284 del UserDict

Mercurial > cpython-lru_cache-weakref

annotate Lib/weakref.py @ 25838:8540887bcec6 2.2