41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
# This file is part of Hypothesis, which may be found at
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# https://github.com/HypothesisWorks/hypothesis/
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#
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# Most of this work is copyright (C) 2013-2021 David R. MacIver
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# (david@drmaciver.com), but it contains contributions by others. See
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# CONTRIBUTING.rst for a full list of people who may hold copyright, and
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# consult the git log if you need to determine who owns an individual
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# contribution.
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#
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# This Source Code Form is subject to the terms of the Mozilla Public License,
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# v. 2.0. If a copy of the MPL was not distributed with this file, You can
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# obtain one at https://mozilla.org/MPL/2.0/.
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#
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# END HEADER
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import threading
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from contextlib import contextmanager
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class DynamicVariable:
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def __init__(self, default):
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self.default = default
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self.data = threading.local()
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@property
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def value(self):
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return getattr(self.data, "value", self.default)
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@value.setter
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def value(self, value):
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self.data.value = value
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@contextmanager
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def with_value(self, value):
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old_value = self.value
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try:
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self.data.value = value
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yield
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finally:
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self.data.value = old_value
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