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