/usr/lib/python2.7/dist-packages/tables/misc/proxydict.py is in python-tables 3.1.1-3.
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The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | # -*- coding: utf-8 -*-
########################################################################
#
# License: BSD
# Created: 2005-07-07
# Author: Ivan Vilata i Balaguer - ivan@selidor.net
#
# $Id$
#
########################################################################
"""Proxy dictionary for objects stored in a container."""
import weakref
from tables._past import previous_api, previous_api_property
class ProxyDict(dict):
"""A dictionary which uses a container object to store its values."""
containerRef = previous_api_property('containerref')
def __init__(self, container):
self.containerref = weakref.ref(container)
"""A weak reference to the container object.
.. versionchanged:: 3.0
The *containerRef* attribute has been renamed into
*containerref*.
"""
def __getitem__(self, key):
if key not in self:
raise KeyError(key)
# Values are not actually stored to avoid extra references.
return self._get_value_from_container(self._get_container(), key)
def __setitem__(self, key, value):
# Values are not actually stored to avoid extra references.
super(ProxyDict, self).__setitem__(key, None)
def __repr__(self):
return object.__repr__(self)
def __str__(self):
# C implementation does not use `self.__getitem__()`. :(
itemFormat = '%r: %r'
itemReprs = [itemFormat % item for item in self.iteritems()]
return '{%s}' % ', '.join(itemReprs)
def values(self):
# C implementation does not use `self.__getitem__()`. :(
valueList = []
for key in self.iterkeys():
valueList.append(self[key])
return valueList
def itervalues(self):
# C implementation does not use `self.__getitem__()`. :(
for key in self.iterkeys():
yield self[key]
raise StopIteration
def items(self):
# C implementation does not use `self.__getitem__()`. :(
itemList = []
for key in self.iterkeys():
itemList.append((key, self[key]))
return itemList
def iteritems(self):
# C implementation does not use `self.__getitem__()`. :(
for key in self.iterkeys():
yield (key, self[key])
raise StopIteration
def _get_container(self):
container = self.containerref()
if container is None:
raise ValueError("the container object does no longer exist")
return container
_getContainer = previous_api(_get_container)
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