Ezio Melotti <ezio.melo...@gmail.com> added the comment:
Mixing byte and unicode strings should always be avoided, because the implicit
coercion to unicode works only if the byte strings contains only ASCII, and
fails otherwise.
Several modules -- including shutil, glob, and os.path -- have API that work
with both byte and unicode strings, but fail when you mix the two:
>>> os.path.join('א', 'א') # both byte strings -- works
'\xd7\x90/\xd7\x90'
>>> os.path.join(u'א', u'א') # both unicode -- works
u'\u05d0/\u05d0'
>>> os.path.join('a', u'א') # mixed, ASCII-only byte string -- works
u'a/\u05d0'
>>> os.path.join(u'א', 'א') # mixed, non-ASCII -- fails
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.6/posixpath.py", line 70, in join
path += '/' + b
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd7 in position 1: ordinal
not in range(128)
>>> os.path.join('א', u'א') # mixed, non-ASCII -- fails
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.6/posixpath.py", line 70, in join
path += '/' + b
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd7 in position 0: ordinal
not in range(128)
>>>
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11741>
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