diff options
Diffstat (limited to 'Lib/posixpath.py')
| -rw-r--r-- | Lib/posixpath.py | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/Lib/posixpath.py b/Lib/posixpath.py index 1521236..6f15d48 100644 --- a/Lib/posixpath.py +++ b/Lib/posixpath.py @@ -12,6 +12,7 @@ for manipulation of the pathname component of URLs. import os import stat +import genericpath from genericpath import * __all__ = ["normcase","isabs","join","splitdrive","split","splitext", @@ -20,7 +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 = '.' @@ -88,14 +89,8 @@ def split(p): # It is always true that root + ext == p. def splitext(p): - """Split the extension from a pathname. Extension is everything from the - last dot to the end. Returns "(root, ext)", either part may be empty.""" - i = p.rfind('.') - if i<=p.rfind('/'): - return p, '' - else: - return p[:i], p[i:] - + return genericpath._splitext(p, sep, altsep, extsep) +splitext.__doc__ = genericpath._splitext.__doc__ # Split a pathname into a drive specification and the rest of the # path. Useful on DOS/Windows/NT; on Unix, the drive is always empty. @@ -387,3 +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) |