From 3572c861d8e8f03c34793608e7e2221e116aaec0 Mon Sep 17 00:00:00 2001 From: Barney Gale Date: Sun, 5 Mar 2023 22:00:56 +0000 Subject: GH-101362: Call join() only when >1 argument supplied to pathlib.PurePath() (#101665) GH-101362: Call join() only when >1 argument supplied to pathlib.PurePath This reduces the time taken to run `PurePath("foo")` by ~15% --- Lib/pathlib.py | 5 ++++- .../next/Library/2023-02-07-21-16-41.gh-issue-101362.KMQllM.rst | 2 ++ 2 files changed, 6 insertions(+), 1 deletion(-) create mode 100644 Misc/NEWS.d/next/Library/2023-02-07-21-16-41.gh-issue-101362.KMQllM.rst diff --git a/Lib/pathlib.py b/Lib/pathlib.py index dde5735..ed0f2cc 100644 --- a/Lib/pathlib.py +++ b/Lib/pathlib.py @@ -275,9 +275,12 @@ class PurePath(object): 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) diff --git a/Misc/NEWS.d/next/Library/2023-02-07-21-16-41.gh-issue-101362.KMQllM.rst b/Misc/NEWS.d/next/Library/2023-02-07-21-16-41.gh-issue-101362.KMQllM.rst new file mode 100644 index 0000000..af4ee9a --- /dev/null +++ b/Misc/NEWS.d/next/Library/2023-02-07-21-16-41.gh-issue-101362.KMQllM.rst @@ -0,0 +1,2 @@ +Speed up :class:`pathlib.PurePath` construction by calling +:func:`os.path.join` only when two or more arguments are given. -- cgit v0.12