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Title: GH-101362: Omit path anchor from `pathlib.PurePath()._parts` by barneygale · Pull Request #102476 · python/cpython · GitHub

Open Graph Title: GH-101362: Omit path anchor from `pathlib.PurePath()._parts` by barneygale · Pull Request #102476 · python/cpython

X Title: GH-101362: Omit path anchor from `pathlib.PurePath()._parts` by barneygale · Pull Request #102476 · python/cpython

Description: Improve performance of path construction by skipping the addition of the path anchor (drive + root) to the internal _parts list. Rename this attribute to _tail for clarity. Also: Simplify the implementations of name, parent, and parents a little. Optimize _make_child_relpath() by building the new string path with naive string concatination rather than _format_parsed_parts(). Optimize __hash__() and __eq__() by referring to the unsplit case-normalized path. Optimize __lt__() etc by referring to the naively split case-normalized path (i.e. split on sep without consideration of anchor) The public parts tuple is unaffected. $ ./python -m timeit -s 'from pathlib import PureWindowsPath as P' 'P("C:/foo/bar.py")' 100000 loops, best of 5: 1.98 usec per loop # before 200000 loops, best of 5: 1.75 usec per loop # after Issue: gh-101362

Open Graph Description: Improve performance of path construction by skipping the addition of the path anchor (drive + root) to the internal _parts list. Rename this attribute to _tail for clarity. Also: Simplify the impl...

X Description: Improve performance of path construction by skipping the addition of the path anchor (drive + root) to the internal _parts list. Rename this attribute to _tail for clarity. Also: Simplify the impl...

Opengraph URL: https://github.com/python/cpython/pull/102476

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8bf4600 GH-101362: Omit path anchor from `pathlib.PurePath()._parts` barneygale Mar 6, 2023 https://github.com/python/cpython/pull/102476/commits/8bf4600d524fc3e1f6bdad10843b06805f870c0d
e7a58c3 Add news blurb. barneygale Mar 6, 2023 https://github.com/python/cpython/pull/102476/commits/e7a58c33f1a8f12d0c264cc222f7cacb6345d30b
1d58aed Rename `_parts` to `_tail` for clarity. barneygale Mar 6, 2023 https://github.com/python/cpython/pull/102476/commits/1d58aeda3fe46f4a62aaf2554402e2bdc834c6ec
ac26f84 Merge branch 'main' into gh-101362-exclude-anchor-from-parts barneygale Mar 10, 2023 https://github.com/python/cpython/pull/102476/commits/ac26f8474c54e09b7e9c85f7afb7be066e1286af
cce5d7b Undo some changes to _format_parsed_parts() barneygale Mar 10, 2023 https://github.com/python/cpython/pull/102476/commits/cce5d7ba5087120f742b3b213a8165fc9b8108c2
f529d51 Merge branch 'main' into gh-101362-exclude-anchor-from-parts barneygale Apr 3, 2023 https://github.com/python/cpython/pull/102476/commits/f529d5136eb2d9c2e375220d6fc770a8e4771f45
0c0f5bd Move `str()` call out of initialiser. barneygale Apr 3, 2023 https://github.com/python/cpython/pull/102476/commits/0c0f5bd6ec2c6779cf2b80d220f18bc1cd83f770
7a4e92f Optimize `_make_child_relpath()` barneygale Apr 3, 2023 https://github.com/python/cpython/pull/102476/commits/7a4e92fdf1d87d5f6b560c118e3ce827082619cd
c8d4b38 Remove caching of `Path.parts` barneygale Apr 3, 2023 https://github.com/python/cpython/pull/102476/commits/c8d4b384e6106cb486c5f5e4cf1be1fc99225ebf
d2a578d Cache case-normalized string. barneygale Apr 6, 2023 https://github.com/python/cpython/pull/102476/commits/d2a578db100e7aa50212e9ca6f31433a4c36aad2
de4df7a Rename `_make_child` back to `_make_child_relpath` barneygale Apr 7, 2023 https://github.com/python/cpython/pull/102476/commits/de4df7adb6efdc9721ba8bdd8a9b8017812f6199
5a34f7e Add comments to `PurePath.__slots__` barneygale Apr 8, 2023 https://github.com/python/cpython/pull/102476/commits/5a34f7e3046e158597e450249cf1b1d6f8a74940
078ced9 Merge branch 'main' into gh-101362-exclude-anchor-from-parts barneygale Apr 9, 2023 https://github.com/python/cpython/pull/102476/commits/078ced9c8934d4bbb94c282c798c13a51bc13c38
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