normpath() sometimes maps unicode to str

[sandberg]

BPO	6450
Nosy	@loewis, @ezio-melotti
Superseder	bpo-5827: os.path.normpath doesn't preserve unicode

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2009-11-14.00:38:19.089>
created_at = <Date 2009-07-09.18:49:55.169>
labels = ['type-bug', 'library', 'expert-unicode']
title = 'normpath() sometimes maps unicode to str'
updated_at = <Date 2009-11-14.00:38:19.088>
user = 'https://bugs.python.org/sandberg'

bugs.python.org fields:

activity = <Date 2009-11-14.00:38:19.088>
actor = 'ezio.melotti'
assignee = 'none'
closed = True
closed_date = <Date 2009-11-14.00:38:19.089>
closer = 'ezio.melotti'
components = ['Library (Lib)', 'Unicode']
creation = <Date 2009-07-09.18:49:55.169>
creator = 'sandberg'
dependencies = []
files = []
hgrepos = []
issue_num = 6450
keywords = []
message_count = 4.0
messages = ['90341', '90343', '94965', '95222']
nosy_count = 4.0
nosy_names = ['loewis', 'kcwu', 'ezio.melotti', 'sandberg']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '5827'
type = 'behavior'
url = 'https://bugs.python.org/issue6450'
versions = ['Python 2.6', 'Python 2.7']

[sandberg]

On Linux, I get the following:

>>> import os
>>> os.path.normpath(u'/')
'/'

I would expect unicode to be mapped to unicode. os.path.abspath() has
the same problem, see also bpo-3426.

This causes problems in my project, where a function requires its
parameters to be Unicode. Do the standard Python library functions that
operate on strings guarantee anything in general with respect to
conserving unicode? Can I make any assumption as to which codec was used
to encode the str returned from normpath?

[loewis]

Do the standard Python library functions that
operate on strings guarantee anything in general with respect to
conserving unicode? Can I make any assumption as to which codec was used
to encode the str returned from normpath?

The bug tracker is not really a place to ask questions. Please ask them
on python-list or elsewhere, or read the source code of normpath.

[kcwu]

see bpo-5827, it includes a patch fixing this issue.

[ezio-melotti]

Closing this as duplicate of bpo-5827.