2 # Author: Georg Brandl <georg@python.org>
3 # Copyright: This module has been placed in the public domain.
6 Python 2/3 compatibility definitions.
8 This module currently provides the following helper symbols:
10 * bytes (name of byte string type; str in 2.x, bytes in 3.x)
11 * b (function converting a string literal to an ASCII byte string;
12 can be also used to convert a Unicode string into a byte string)
13 * u_prefix (unicode repr prefix: 'u' in 2.x, '' in 3.x)
14 (Required in docutils/test/test_publisher.py)
15 * BytesIO (a StringIO class that works with bytestrings)
20 if sys
.version_info
< (3,0):
23 from StringIO
import StringIO
as BytesIO
26 bytes
= builtins
.bytes
29 if isinstance(s
, str):
30 return s
.encode('latin1')
31 elif isinstance(s
, bytes
):
34 raise TypeError("Invalid argument %r for b()" % (s
,))
35 # using this hack since 2to3 "fixes" the relative import
36 # when using ``from io import BytesIO``
37 BytesIO
= __import__('io').BytesIO
39 if sys
.version_info
< (2,5):
42 def __import__(name
, globals={}, locals={}, fromlist
=[], level
=-1):
43 """Compatibility definition for Python 2.4.
45 Silently ignore the `level` argument missing in Python < 2.5.
47 # we need the level arg because the default changed in Python 3.3
48 return __builtin__
.__import
__(name
, globals, locals, fromlist
)