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GeezerVison is showing github.com — gh-137855: Improve import time of `pathlib` by hugovk · Pull Request #146327 · python/cpython

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@hugovk

@hugovk hugovk commented Mar 23, 2026 •
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  • Lazily import from glob.
  • Move the deferred shutil import (python/cpython#123520) to lazy.
Before: 7ms After: 2ms
image image
  • Issue: Improve import time of various stdlib modules #137855

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@hugovk
Improve import time of pathlib
f0d631f
@hugovk hugovk added performance Performance or resource usage stdlib Standard Library Python modules in the Lib/ directory labels Mar 23, 2026
@hugovk
hugovk requested a review from barneygale as a code owner March 23, 2026 12:14
@bedevere-app bedevere-app Bot added the awaiting core review label Mar 23, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Mar 23, 2026
Improve import time of various stdlib modules #137855
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@hugovk hugovk added the skip news label Mar 23, 2026
@hugovk
Merge branch 'main' into 3.15-lazy-pathlib
4fa8e23
@hugovk

hugovk commented May 4, 2026

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Confirmed after merge of #149338 that the -Xlazy_imports=none commands from #149321 work as expected.
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encukou
encukou approved these changes May 5, 2026
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Looks good, thank you!

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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting core review labels May 5, 2026
@encukou
encukou merged commit ffb543d into python:main May 5, 2026
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@bedevere-app bedevere-app Bot removed the awaiting merge label May 5, 2026
@hugovk
hugovk deleted the 3.15-lazy-pathlib branch May 5, 2026 12:48
@hugovk hugovk mentioned this pull request Jun 17, 2026
Use lazy imports on Python 3.15 to improve startup speed jazzband/tablib#645
Merged
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@encukou encukou encukou approved these changes
@barneygale barneygale Awaiting requested review from barneygale barneygale is a code owner

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performance Performance or resource usage skip news stdlib Standard Library Python modules in the Lib/ directory

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@hugovk @encukou
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