pythongh-117641: Improve the perfornance of posixpath.commonpath() (p…

…ython#117652)
hudson-trading · Apr 18, 2024 · b848b94 · b848b94
1 parent 6078f20
commit b848b94
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diff --git a/Lib/posixpath.py b/Lib/posixpath.py
@@ -550,7 +550,7 @@ def commonpath(paths):
         split_paths = [path.split(sep) for path in paths]
 
         try:
-            isabs, = set(p[:1] == sep for p in paths)
+            isabs, = {p.startswith(sep) for p in paths}
         except ValueError:
             raise ValueError("Can't mix absolute and relative paths") from None
 

diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-04-08-19-30-38.gh-issue-117641.oaBGSJ.rst b/Misc/NEWS.d/next/Core and Builtins/2024-04-08-19-30-38.gh-issue-117641.oaBGSJ.rst
@@ -0,0 +1 @@
+Speedup :func:`os.path.commonpath` on Unix.