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Speed up pathlib by removing a few temporary objects #112361

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Speed up pathlib by removing a few temporary objects#112361
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performancePerformance or resource usagetopic-pathlib

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@barneygale
barneygale
opened on Nov 24, 2023

A handful of pathlib methods that create paths with modified names, or additional segments, use list objects that are quickly thrown away. We can speed these methods up by only creating new lists where strictly necessary.

Specifically:

  • with_name() (performance of self._tail[:-1] + [name] is cursed)
  • with_suffix()
  • _make_child_relpath() (used in glob() and walk())
  • glob() (when parsing the pattern)

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  1. barneygale
    added
    performancePerformance or resource usage
    topic-pathlib
    on Nov 24, 2023
  2. barneygale
    added 2 commits that reference this issue on Nov 24, 2023

    pythonGH-112361: Speed up pathlib by removing some temporary objects.

    12e2551

    GH-112361: Speed up pathlib by removing some temporary objects. (#112362

    19a1fc1
  3. barneygale
    closed this as completedon Nov 28, 2023
  4. aisk
    added a commit that references this issue on Feb 11, 2024

    pythonGH-112361: Speed up pathlib by removing some temporary objects. (…

    7563b4c
  5. Glyphack
    added a commit that references this issue on Sep 2, 2024

    pythonGH-112361: Speed up pathlib by removing some temporary objects. (…

    b3e372b
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