Please help me finding a way to implement os.path.issubpath(a, b)

Diez B. Roggisch deets at
Thu Sep 11 20:09:06 CEST 2008

Giampaolo Rodola' schrieb:
> Hi,
> I'm trying to implement a function which returns whether a path is a
> subpath of another one (e.g. /a/b/c is a subpath of /a/b).
> I wrote this function which apparently seems to work fine:
> import os
> def issubpath(path1, path2):
>     """Return True if path1 is a sub path of path2."""
>     if path1 == path2:
>         return False
>     x1 = path1.split(os.sep)
>     x2 = path2.split(os.sep)
>     return x1[:len(x2)] == x2
> ...but if I use "issubpath('C:\\dir', 'C:\\')" it returns False.
> A little help would be appreciated.

Any reason why

os.path.normpath(a).startswith(os.normpath(b)) doesn't do the trick?


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