55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
#!/usr/bin/env python
|
|
#
|
|
# Source: https://github.com/slezica/python-frozendict
|
|
#
|
|
# Copyright (c) 2012 Santiago Lezica
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
# in the Software without restriction, including without limitation the rights
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
# furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included in all
|
|
# copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
# SOFTWARE.
|
|
|
|
import collections, operator
|
|
|
|
class frozendict(collections.Mapping):
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
self.__dict = dict(*args, **kwargs)
|
|
self.__hash = None
|
|
|
|
def __getitem__(self, key):
|
|
return self.__dict[key]
|
|
|
|
def copy(self, **add_or_replace):
|
|
new = frozendict(self)
|
|
new.__dict.update(add_or_replace) # Feels like cheating
|
|
return new
|
|
|
|
def __iter__(self):
|
|
return iter(self.__dict)
|
|
|
|
def __len__(self):
|
|
return len(self.__dict)
|
|
|
|
def __repr__(self):
|
|
return '<frozendict %s>' % repr(self.__dict)
|
|
|
|
def __hash__(self):
|
|
if self.__hash is None:
|
|
self.__hash = reduce(operator.xor, map(hash, self.iteritems()), 0)
|
|
|
|
return self.__hash
|