49 lines
1.5 KiB
Python
49 lines
1.5 KiB
Python
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# $Id: _compat.py 7486 2012-07-11 12:25:14Z milde $
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# Author: Georg Brandl <georg@python.org>
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# Copyright: This module has been placed in the public domain.
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"""
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Python 2/3 compatibility definitions.
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This module currently provides the following helper symbols:
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* bytes (name of byte string type; str in 2.x, bytes in 3.x)
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* b (function converting a string literal to an ASCII byte string;
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can be also used to convert a Unicode string into a byte string)
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* u_prefix (unicode repr prefix: 'u' in 2.x, '' in 3.x)
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(Required in docutils/test/test_publisher.py)
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* BytesIO (a StringIO class that works with bytestrings)
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"""
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import sys
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if sys.version_info < (3,0):
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b = bytes = str
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u_prefix = 'u'
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from io import StringIO as BytesIO
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else:
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import builtins
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bytes = builtins.bytes
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u_prefix = ''
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def b(s):
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if isinstance(s, str):
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return s.encode('latin1')
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elif isinstance(s, bytes):
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return s
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else:
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raise TypeError("Invalid argument %r for b()" % (s,))
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# using this hack since 2to3 "fixes" the relative import
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# when using ``from io import BytesIO``
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BytesIO = __import__('io').BytesIO
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if sys.version_info < (2,5):
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import builtins
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def __import__(name, globals={}, locals={}, fromlist=[], level=-1):
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"""Compatibility definition for Python 2.4.
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Silently ignore the `level` argument missing in Python < 2.5.
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"""
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# we need the level arg because the default changed in Python 3.3
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return builtins.__import__(name, globals, locals, fromlist)
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