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GH-125413: pathlib ABCs: use `scandir()` to speed up `walk()` by barneygale · Pull Request #126262 · python/cpython · GitHub

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GH-125413: pathlib ABCs: use scandir() to speed up walk() #126262

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Merged
barneygale merged 2 commits into from
Nov 1, 2024
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GH-125413: pathlib ABCs: use scandir() to speed up walk() #126262

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5e1325b
GH-125413: pathlib ABCs: use `scandir()` to speed up `walk()`
barneygale Nov 1, 2024
55acbc0
Merge branch 'main' into gh-125413-walk
barneygale Nov 1, 2024
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22 changes: 12 additions & 10 deletions Lib/pathlib/_abc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -693,16 +693,18 @@ def walk(self, top_down=True, on_error=None, follow_symlinks=False):
if not top_down:
paths.append((path, dirnames, filenames))
try:
for child in path.iterdir():
try:
if child.is_dir(follow_symlinks=follow_symlinks):
if not top_down:
paths.append(child)
dirnames.append(child.name)
else:
filenames.append(child.name)
except OSError:
filenames.append(child.name)
with path.scandir() as entries:
for entry in entries:
name = entry.name
try:
if entry.is_dir(follow_symlinks=follow_symlinks):
if not top_down:
paths.append(path.joinpath(name))
dirnames.append(name)
else:
filenames.append(name)
except OSError:
filenames.append(name)
except OSError as error:
if on_error is not None:
on_error(error)
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4 changes: 2 additions & 2 deletions Lib/test/test_pathlib/test_pathlib_abc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1951,7 +1951,7 @@ def ordered_walk(path):
if self.can_symlink:
# Add some symlinks
source.joinpath('linkC').symlink_to('fileC')
source.joinpath('linkD').symlink_to('dirD')
source.joinpath('linkD').symlink_to('dirD', target_is_directory=True)

# Perform the copy
target = base / 'copyC'
Expand Down Expand Up @@ -2969,7 +2969,7 @@ def setUpWalk(self):
f.write(f"I'm {path} and proud of it. Blame test_pathlib.\n")

if self.can_symlink:
self.link_path.symlink_to(t2_path)
self.link_path.symlink_to(t2_path, target_is_directory=True)
broken_link_path.symlink_to('broken')
broken_link2_path.symlink_to(self.cls('tmp3', 'broken'))
self.sub2_tree = (self.sub2_path, [], ["broken_link", "broken_link2", "link", "tmp3"])
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