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46 lines
1.2 KiB
46 lines
1.2 KiB
"""Declare basic string types unambiguously for various Python versions.
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Authors
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-------
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* MinRK
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"""
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# Copyright (C) PyZMQ Developers
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# Distributed under the terms of the Modified BSD License.
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import sys
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if sys.version_info[0] >= 3:
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bytes = bytes
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unicode = str
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basestring = (bytes, unicode)
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else:
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unicode = unicode
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bytes = str
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basestring = basestring
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def cast_bytes(s, encoding='utf8', errors='strict'):
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"""cast unicode or bytes to bytes"""
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if isinstance(s, bytes):
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return s
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elif isinstance(s, unicode):
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return s.encode(encoding, errors)
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else:
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raise TypeError("Expected unicode or bytes, got %r" % s)
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def cast_unicode(s, encoding='utf8', errors='strict'):
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"""cast bytes or unicode to unicode"""
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if isinstance(s, bytes):
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return s.decode(encoding, errors)
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elif isinstance(s, unicode):
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return s
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else:
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raise TypeError("Expected unicode or bytes, got %r" % s)
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# give short 'b' alias for cast_bytes, so that we can use fake b('stuff')
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# to simulate b'stuff'
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b = asbytes = cast_bytes
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u = cast_unicode
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__all__ = ['asbytes', 'bytes', 'unicode', 'basestring', 'b', 'u', 'cast_bytes', 'cast_unicode']
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