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author | Collin Winter <collinw@gmail.com> | 2007-03-16 22:16:08 (GMT) |
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committer | Collin Winter <collinw@gmail.com> | 2007-03-16 22:16:08 (GMT) |
commit | 6f187743ffbce522c9d686ae5393272c1eb85dcc (patch) | |
tree | 49954823525566e80d435c3f9acff30a1a54e58d /Lib/posixpath.py | |
parent | 6de691d78ce696d897e4c58c3fc8fd7d3f6f1359 (diff) | |
download | cpython-6f187743ffbce522c9d686ae5393272c1eb85dcc.zip cpython-6f187743ffbce522c9d686ae5393272c1eb85dcc.tar.gz cpython-6f187743ffbce522c9d686ae5393272c1eb85dcc.tar.bz2 |
Patch 1339796: add a relpath() function to os.path.
Diffstat (limited to 'Lib/posixpath.py')
-rw-r--r-- | Lib/posixpath.py | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/Lib/posixpath.py b/Lib/posixpath.py index 661d8db..9117208 100644 --- a/Lib/posixpath.py +++ b/Lib/posixpath.py @@ -21,7 +21,7 @@ __all__ = ["normcase","isabs","join","splitdrive","split","splitext", "ismount","walk","expanduser","expandvars","normpath","abspath", "samefile","sameopenfile","samestat", "curdir","pardir","sep","pathsep","defpath","altsep","extsep", - "devnull","realpath","supports_unicode_filenames"] + "devnull","realpath","supports_unicode_filenames","relpath"] # strings representing various path-related bits and pieces curdir = '.' @@ -382,3 +382,18 @@ def _resolve_link(path): return path supports_unicode_filenames = False + +def relpath(path, start=curdir): + """Return a relative version of a path""" + + if not path: + raise ValueError("no path specified") + + start_list = abspath(start).split(sep) + path_list = abspath(path).split(sep) + + # Work out how much of the filepath is shared by start and path. + i = len(commonprefix([start_list, path_list])) + + rel_list = [pardir] * (len(start_list)-i) + path_list[i:] + return join(*rel_list) |