[3.12] gh-127001: Fix PATHEXT issues in shutil.which() on Windows (GH-127035) #127158
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…ws (pythonGH-127035) * Name without a PATHEXT extension is only searched if the mode does not include X_OK. * Support multi-component PATHEXT extensions (e.g. ".foo.bar"). * Support files without extensions in PATHEXT contains dot-only extension (".", "..", etc). * Support PATHEXT extensions that end with a dot (e.g. ".foo."). (cherry picked from commit 8899e85) Co-authored-by: Serhiy Storchaka <[email protected]>
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