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##
# Transcribed from http://code.activestate.com/recipes/523034/ on May 1, 2009
# by Jef Spaleta This code provides an emulation for the defaultdict
# functionality introduced in python 2.5's collection module
#
# Changes from the original:
# * Change the return value from __reduce__ to use iteritems() to prevent
# a segfault when pickling. (Jef Spaleta)
# * Change how we setup the module to use collections.defaultdict by default
# (Toshio Kuratomi)
#
# Copyright (c) 2007 Justin Kirtland
#
# PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
# --------------------------------------------
#
# 1. This LICENSE AGREEMENT is between the Python Software Foundation ("PSF"),
# and the Individual or Organization ("Licensee") accessing and otherwise
# using this software ("Python") in source or binary form and its
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# derivative works, distribute, and otherwise use Python alone or in any
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'''
-----------
defaultdict
-----------
This is a pure python implementation of defaultdict that is compatible with
the defaultdict class provided by python-2.5 and above.
.. seealso::
:class:`collections.defaultdict`
for documentation on this module
'''
# Pylint disabled messages
#
# :C0103: We're defnining a compatible class name therefore we need to match
# the format of that name.
import types
from kitchen import b_
# :C0103, W0613: We're implementing the python-2.5 defaultdict API so
# we have to use the same names as python.
# :C0111: We point people at the stdlib API docs for defaultdict rather than
# reproduce it here.
#pylint:disable-msg=C0103,W0613,C0111
class defaultdict(dict):
def __init__(self, default_factory=None, *args, **kwargs):
if (default_factory is not None and
not hasattr(default_factory, '__call__')):
raise TypeError(b_('First argument must be callable'))
dict.__init__(self, *args, **kwargs)
self.default_factory = default_factory
def __getitem__(self, key):
try:
return dict.__getitem__(self, key)
except KeyError:
return self.__missing__(key)
def __missing__(self, key):
if self.default_factory is None:
raise KeyError(key)
self[key] = value = self.default_factory()
return value
def __reduce__(self):
if self.default_factory is None:
args = tuple()
else:
args = self.default_factory,
return type(self), args, None, None, self.iteritems()
def copy(self):
return self.__copy__()
def __copy__(self):
return type(self)(self.default_factory, self)
def __deepcopy__(self, memo):
import copy
return type(self)(self.default_factory,
copy.deepcopy(self.items()))
def __repr__(self):
# Note: Have to use "is not None" otherwise we get an infinite
# recursion
if isinstance(self.default_factory, types.MethodType) \
and self.default_factory.im_self is not None \
and issubclass(self.default_factory.im_class, defaultdict):
defrepr = '<bound method sub._factory of defaultdict(...'
else:
defrepr = repr(self.default_factory)
return 'defaultdict(%s, %s)' % (defrepr, dict.__repr__(self))
__all__ = ('defaultdict',)