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GH-104104: Optimizepathlib.Path.glob() by avoiding repeated calls toos.path.normcase()#104105

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barneygale
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@barneygalebarneygale commentedMay 2, 2023
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Usere.IGNORECASE to implement case-insensitive matching. This restores behaviour from before#31691.

$ ./python -m timeit -s 'from pathlib import Path; p = Path()' 'list(p.glob("Lib/*.py"))'500 loops, best of 5: 403 usec per loop   # before1000 loops, best of 5: 389 usec per loop  # after

…calls to `os.path.normcase()`Use `re.IGNORECASE` to implement case-insensitive matching. Thisrestores behaviour from beforepython#31691.
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That's a great speedup! LGTM.

What was the motivation for moving to thenormcase-based implementation in#31691? Did it just feel simpler at the time?

@AlexWaygoodAlexWaygood added type-featureA feature request or enhancement 3.12only security fixes labelsMay 2, 2023
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What was the motivation for moving to thenormcase-based implementation in#31691? Did it just feel simpler at the time?

Mostly becauseos.path doesn't have an attribute indicating whether it's case sensitive or not, and it didn't occur to me at the time to usenormcase('Aa') == 'Aa'.

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@barneygalebarneygale merged commit47770a1 intopython:mainMay 2, 2023
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Thanks for the review! :-)

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I think you should add an entry to "What's new in 3.12" about all the great optimisation work you've been doing on pathlib. It's a really good improvement that's worth celebrating :)

carljm added a commit to carljm/cpython that referenced this pull requestMay 2, 2023
* main: (760 commits)pythonGH-104102: Optimize `pathlib.Path.glob()` handling of `../` pattern segments (pythonGH-104103)pythonGH-104104: Optimize `pathlib.Path.glob()` by avoiding repeated calls to `os.path.normcase()` (pythonGH-104105)pythongh-103822: [Calendar] change return value to enum for day and month APIs (pythonGH-103827)pythongh-65022: Fix description of tuple return value in copyreg (python#103892)pythonGH-103525: Improve exception message from `pathlib.PurePath()` (pythonGH-103526)pythongh-84436: Add integration C API tests for immortal objects (pythongh-103962)pythongh-103743: Add PyUnstable_Object_GC_NewWithExtraData (pythonGH-103744)pythongh-102997: Update Windows installer to SQLite 3.41.2. (python#102999)pythonGH-103484: Fix redirected permanently URLs (python#104001)  Improve assert_type phrasing (python#104081)pythongh-102997: Update macOS installer to SQLite 3.41.2. (pythonGH-102998)pythonGH-103472: close response in HTTPConnection._tunnel (python#103473)pythongh-88496: IDLE - fix another test on macOS (python#104075)pythongh-94673: Hide Objects in PyTypeObject Behind Accessors (pythongh-104074)pythongh-94673: Properly Initialize and Finalize Static Builtin Types for Each Interpreter (pythongh-104072)pythongh-104016: Skip test for deeply neste f-strings on wasi (python#104071)pythongh-104057: Fix direct invocation of test_super (python#104064)pythongh-87092: Expose assembler to unit tests (python#103988)pythongh-97696: asyncio eager tasks factory (python#102853)pythongh-84436: Immortalize in _PyStructSequence_InitBuiltinWithFlags() (pythongh-104054)  ...
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