56 lines
2.1 KiB
Python
56 lines
2.1 KiB
Python
"""BSD 3-Clause License
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Copyright (c) 2017, SymonSoft
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Copyright (c) 2019, Juraj Oravec
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."""
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import sys
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_true_set = {'yes', 'true', 't', 'y', '1'}
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_false_set = {'no', 'false', 'f', 'n', '0'}
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def str2bool(value, raise_exc=False):
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if isinstance(value, bool):
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return value
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if isinstance(value, str) or sys.version_info[0] < 3 and isinstance(value, basestring):
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value = value.lower()
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if value in _true_set:
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return True
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if value in _false_set:
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return False
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if raise_exc:
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raise ValueError('Expected "%s"' % '", "'.join(_true_set | _false_set))
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return None
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def str2bool_exc(value):
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return str2bool(value, raise_exc=True)
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