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GeezerVison is showing github.com — GH-78722: Raise exceptions from `pathlib.Path.iterdir()` without delay. by barneygale · Pull Request #107320 · python/cpython

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@barneygale

@barneygale barneygale commented Jul 26, 2023 •
edited by bedevere-bot
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pathlib.Path.iterdir() now immediately raises any OSError exception from os.listdir(), rather than waiting until its result is iterated over.

  • Issue: pathlib.Path.iterdir doesn't raise an exception until you start iterating #78722

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@barneygale
pythonGH-78722: Raise exceptions from pathlib.Path.iterdir() withou…
4d552aa 
…t delay.

`pathlib.Path.iterdir()` now immediately raises any `OSError`
exception from `os.listdir()`, rather than waiting until its
result is iterated over.
@barneygale barneygale added the topic-pathlib label Jul 26, 2023
@barneygale barneygale assigned jaraco Jul 26, 2023
@bedevere-bot bedevere-bot mentioned this pull request Jul 26, 2023
pathlib.Path.iterdir doesn't raise an exception until you start iterating #78722
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@bedevere-bot bedevere-bot added the awaiting core review label Jul 26, 2023
@barneygale
barneygale requested a review from jaraco July 26, 2023 21:56
@barneygale barneygale unassigned jaraco Jul 26, 2023
@barneygale
barneygale merged commit bdc3c88 into python:main Sep 2, 2023
@bedevere-bot bedevere-bot removed the awaiting core review label Sep 2, 2023
@tomasr8 tomasr8 mentioned this pull request Feb 8, 2025
Pathlib.iterdir semantics change dramatically under Python 3.13 #129871
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@jaraco

jaraco commented Feb 8, 2025

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Wow. I'd forgotten I'd reviewed this change (or at least endorsed the proposal) when I was caught by surprise in jaraco/develop#26 (then #129871). That code was relying on the lazy exception behavior. I ended up working around the issue by relying on glob instead of iterdir to get the lenient behavior back.

I don't see any mention of this change in "what's new for Python 3.13". Maybe there should be a mention of it.

I'm now also a little skeptical of the value of this change. It shows that there are at least some cases where people might be relying on the late resolution of the error. We can discuss in the new issue.
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tumidi added a commit to questionpy-org/questionpy-sdk that referenced this pull request Jul 23, 2025
@tumidi
fix: account for iterdir() behavior change in Python 3.13
4511baa 
In Python 3.13, `iterdir()` raises exceptions immediately instead of lazily.
This change forces early evaluation to ensure consistent behavior across
Python versions.

Ref: python/cpython#107320
tumidi added a commit to questionpy-org/questionpy-sdk that referenced this pull request Aug 21, 2025
@tumidi
fix: account for iterdir() behavior change in Python 3.13
bc2d0fb 
In Python 3.13, `iterdir()` raises exceptions immediately instead of lazily.
This change forces early evaluation to ensure consistent behavior across
Python versions.

Ref: python/cpython#107320
tumidi added a commit to questionpy-org/questionpy-sdk that referenced this pull request Aug 21, 2025
@tumidi
fix: account for iterdir() behavior change in Python 3.13
cbeda8f 
In Python 3.13, `iterdir()` raises exceptions immediately instead of lazily.
This change forces early evaluation to ensure consistent behavior across
Python versions.

Ref: python/cpython#107320
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3 participants

@barneygale @jaraco @bedevere-bot
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