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Improve performance of pathlib.Path.[is_]absolute() #103548

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barneygale opened this issue Apr 14, 2023 · 1 comment
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Improve performance of pathlib.Path.[is_]absolute() #103548

barneygale opened this issue Apr 14, 2023 · 1 comment
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3.12 bugs and security fixes performance Performance or resource usage topic-pathlib type-feature A feature request or enhancement

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@barneygale
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barneygale commented Apr 14, 2023 •
edited by bedevere-bot

Two optimizations are possible:

  • is_absolute() can pass the unnormalized path to os.path.isabs()
  • absolute() on an empty path (or Path.cwd()) can avoid joining an empty string onto the working directory (thus avoiding a call to os.path.join()), and short-circuit the string normalization (as the result of getcwd() is fully normalized)

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@barneygale barneygale added type-feature A feature request or enhancement performance Performance or resource usage 3.12 bugs and security fixes topic-pathlib labels Apr 14, 2023
barneygale added a commit to barneygale/cpython that referenced this issue Apr 14, 2023
@barneygale
pythonGH-103548: Improve performance of pathlib.Path.[is_]absolute()
871dbdb 
Pass the *unnormalized* path to `os.path.isabs()`.

When making an empty path absolute, avoid calling `os.path.join()`, and
prevent pathlib from later re-normalizing the result of `os.getcwd()` by
storing it as `path._str`.
@bedevere-bot bedevere-bot mentioned this issue Apr 14, 2023
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barneygale added a commit to barneygale/cpython that referenced this issue Apr 29, 2023
@barneygale
Merge branch 'main' into pythongh-103548-absolute-perf
e2558bb
barneygale added a commit to barneygale/cpython that referenced this issue May 2, 2023
@barneygale
Merge branch 'main' into pythongh-103548-absolute-perf
6e984bc
barneygale added a commit to barneygale/cpython that referenced this issue May 6, 2023
@barneygale
Merge branch 'main' into pythongh-103548-absolute-perf
7d1ebe2
barneygale added a commit that referenced this issue May 6, 2023
@barneygale
GH-103548: Improve performance of pathlib.Path.[is_]absolute() (GH-…
de7f694 
…103549)

Improve performance of `pathlib.Path.absolute()` and `cwd()` by joining paths only when necessary. Also improve
performance of `PurePath.is_absolute()` on Posix by skipping path parsing and normalization.
@barneygale
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Done in 3.12: #103549 / de7f694

jbower-fb pushed a commit to jbower-fb/cpython-jbowerfb that referenced this issue May 8, 2023
@barneygale @jbower-fb
pythonGH-103548: Improve performance of pathlib.Path.[is_]absolute() (
a719df1 
pythonGH-103549)

Improve performance of `pathlib.Path.absolute()` and `cwd()` by joining paths only when necessary. Also improve
performance of `PurePath.is_absolute()` on Posix by skipping path parsing and normalization.
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