43 lines
1.3 KiB
Python
43 lines
1.3 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Copyright 2014-2015 Canonical Limited.
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#
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# This file is part of charm-helpers.
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#
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# charm-helpers is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3 as
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# published by the Free Software Foundation.
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#
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# charm-helpers is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with charm-helpers. If not, see <http://www.gnu.org/licenses/>.
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import six
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def bool_from_string(value):
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"""Interpret string value as boolean.
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Returns True if value translates to True otherwise False.
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"""
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if isinstance(value, six.string_types):
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value = six.text_type(value)
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else:
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msg = "Unable to interpret non-string value '%s' as boolean" % (value)
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raise ValueError(msg)
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value = value.strip().lower()
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if value in ['y', 'yes', 'true', 't', 'on']:
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return True
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elif value in ['n', 'no', 'false', 'f', 'off']:
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return False
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msg = "Unable to interpret string value '%s' as boolean" % (value)
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raise ValueError(msg)
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