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GH-101362: Call join() only when >1 argument supplied to pathlib.PurePath() #101665

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Mar 5, 2023
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GH-101362: Call join() only when >1 argument supplied to pathlib.PurePath() #101665

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5 changes: 4 additions & 1 deletion Lib/pathlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -275,9 +275,12 @@ def __reduce__(self):
def _parse_parts(cls, parts):
if not parts:
return '', '', []
elif len(parts) == 1:
path = os.fspath(parts[0])
else:
path = cls._flavour.join(*parts)
sep = cls._flavour.sep
altsep = cls._flavour.altsep
path = cls._flavour.join(*parts)
if altsep:
path = path.replace(altsep, sep)
drv, root, rel = cls._flavour.splitroot(path)
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2023-02-07-21-16-41.gh-issue-101362.KMQllM.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Speed up :class:`pathlib.PurePath` construction by calling
:func:`os.path.join` only when two or more arguments are given.