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GH-119169: Speed up os.walk(topdown=False)#119186
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Handle errors from `os.scandir()` and `ScandirIterator` similarly, which lets us loop over directory entries with `for`. In top-down mode, call `os.path.join()` at most once per iteration.
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When `os.walk()` traverses into subdirectories in top-down mode, call `os.path.join()` once to add a trailing slash, and use string concatenation thereafter to generate child paths.
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Handle errors from `os.scandir()` and `ScandirIterator` similarly, which lets us loop over directory entries with `for`.
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Closing because reversing sibling traversal order isn't kosher - see discussion on #119473. |
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Sep 9, 2025
…121431) pythonGH-119186: Slightly speed up `os.walk(topdown=True)` When `os.walk()` traverses into subdirectories in top-down mode, call `os.path.join()` once to add a trailing slash, and use string concatenation thereafter to generate child paths.
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Add entries to the stack while iterating over
os.scandir()results, rather than afterwards.os.walk()#119169