45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
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# vim: set fileencoding=utf-8:
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#
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# GPIO Zero: a library for controlling the Raspberry Pi's GPIO pins
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#
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# Copyright (c) 2016-2023 Dave Jones <dave@waveform.org.uk>
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# Copyright (c) 2020 Fangchen Li <fangchen.li@outlook.com>
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# Copyright (c) 2018 Rick Ansell <rick@nbinvincible.org.uk>
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# Copyright (c) 2016 Andrew Scheller <github@loowis.durge.org>
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#
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# SPDX-License-Identifier: BSD-3-Clause
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import operator
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from functools import reduce
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from collections.abc import Mapping
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# Derived from the MIT-licensed https://github.com/slezica/python-frozendict
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class frozendict(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 __contains__(self, key):
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return key in self._dict
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def copy(self, **add_or_replace):
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return frozendict(self, **add_or_replace)
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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 f'<{self.__class__.__name__} {self._dict!r}>'
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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.items()), 0)
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return self._hash
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