os.path.relpath fails when path == start

[townerj]

BPO	1742
Nosy	@birkenfeld

^{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 2008-01-06.14:27:26.387>
created_at = <Date 2008-01-06.12:14:00.624>
labels = ['type-bug', 'library']
title = 'os.path.relpath fails when path == start'
updated_at = <Date 2008-01-06.14:27:26.386>
user = 'https://bugs.python.org/townerj'

bugs.python.org fields:

activity = <Date 2008-01-06.14:27:26.386>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2008-01-06.14:27:26.387>
closer = 'georg.brandl'
components = ['Library (Lib)']
creation = <Date 2008-01-06.12:14:00.624>
creator = 'townerj'
dependencies = []
files = []
hgrepos = []
issue_num = 1742
keywords = []
message_count = 2.0
messages = ['59358', '59374']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'townerj']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue1742'
versions = ['Python 3.0']

[townerj]

os.path.relpath fails with an exception on both Windows and Unix systems
(ntpath and posixpath modules) when the given path and the start path
are equal. Better behavior here might be to return an empty string or
perhaps os.path.curdir.

>>> os.path.relpath("test", "test")
Traceback (most recent call last):
  File "<pyshell#40>", line 1, in <module>
    os.path.relpath("test", "test")
  File "C:\Program Files\Python3K\Lib\ntpath.py", line 495, in relpath
    return join(*rel_list)
TypeError: join() takes at least 1 positional argument (0 given)

[birkenfeld]

Thanks, fixed in r59770.