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-rw-r--r--Lib/genericpath.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/Lib/genericpath.py b/Lib/genericpath.py
index 6714061..303b3b3 100644
--- a/Lib/genericpath.py
+++ b/Lib/genericpath.py
@@ -69,6 +69,12 @@ def getctime(filename):
def commonprefix(m):
"Given a list of pathnames, returns the longest common leading component"
if not m: return ''
+ # Some people pass in a list of pathname parts to operate in an OS-agnostic
+ # fashion; don't try to translate in that case as that's an abuse of the
+ # API and they are already doing what they need to be OS-agnostic and so
+ # they most likely won't be using an os.PathLike object in the sublists.
+ if not isinstance(m[0], (list, tuple)):
+ m = tuple(map(os.fspath, m))
s1 = min(m)
s2 = max(m)
for i, c in enumerate(s1):