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