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# coding=utf-8
#
# This file is part of Hypothesis, which may be found at
# https://github.com/HypothesisWorks/hypothesis-python
#
# Most of this work is copyright (C) 2013-2015 David R. MacIver
# (david@drmaciver.com), but it contains contributions by others. See
# CONTRIBUTING.rst for a full list of people who may hold copyright, and
# consult the git log if you need to determine who owns an individual
# contribution.
#
# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at http://mozilla.org/MPL/2.0/.
#
# END HEADER
from __future__ import division, print_function, absolute_import
import threading
from contextlib import contextmanager
class DynamicVariable(object):
def __init__(self, default):
self.default = default
self.data = threading.local()
@property
def value(self):
return getattr(self.data, 'value', self.default)
@value.setter
def value(self, value):
setattr(self.data, 'value', value)
@contextmanager
def with_value(self, value):
old_value = self.value
try:
self.data.value = value
yield
finally:
self.data.value = old_value