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GeezerVison is showing github.com — gh-154549: warning for `thread_inherit_context` change by nascheme · Pull Request #154558 · python/cpython

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@nascheme

@nascheme nascheme commented Jul 23, 2026 •
edited by bedevere-app Bot
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On GIL-enabled builds, emit a DeprecationWarning when the default implicitly empty threading.Thread() context causes a context variable lookup to differ from the context that a future release will inherit by default.

  • Issue: Warn about future default of thread_inherit_context=1. #154549

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@nascheme
pythongh-154549: warning for thread_inherit_context change
f0ec3e2 
On GIL-enabled builds, emit a DeprecationWarning when the default
implicitly empty threading.Thread() context causes a context variable
lookup to differ from the context that a future release will inherit by
default.
@bedevere-app bedevere-app Bot mentioned this pull request Jul 23, 2026
Warn about future default of thread_inherit_context=1. #154549
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@read-the-docs-community

read-the-docs-community Bot commented Jul 23, 2026

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Documentation build overview

📚 cpython-previews | 🛠️ Build #33730002 | 📁 Comparing f0ec3e2 against main (66e313f)

  🔍 Preview build  

3 files changed
± library/threading.html
± using/cmdline.html
± whatsnew/changelog.html
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@nascheme nascheme mentioned this pull request Jul 24, 2026
Combined PR to show ContextVar changes together #154647
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@nascheme
nascheme marked this pull request as ready for review July 24, 2026 21:52
@nascheme
nascheme requested review from 1st1, FFY00, ZeroIntensity and ericsnowcurrently as code owners July 24, 2026 21:52
@bedevere-app bedevere-app Bot added the awaiting core review label Jul 24, 2026
@nascheme

nascheme commented Aug 1, 2026

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Converting to draft. The warning/default migration should remain separate from the per-variable inheritance API and should not proceed until a default flip is scheduled and libraries have had a release to adopt the mitigation. This is paused rather than abandoned.
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@nascheme
nascheme marked this pull request as draft August 1, 2026 18:53
@bedevere-app bedevere-app Bot removed the awaiting core review label Aug 1, 2026
@github-actions

github-actions Bot commented Nov 6, 2026

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This PR is stale because it has been open for 90 days with no activity.
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@github-actions github-actions Bot added the stale Stale PR or inactive for long period of time. label Nov 6, 2026
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@ericsnowcurrently ericsnowcurrently Awaiting requested review from ericsnowcurrently ericsnowcurrently is a code owner
@ZeroIntensity ZeroIntensity Awaiting requested review from ZeroIntensity ZeroIntensity is a code owner
@FFY00 FFY00 Awaiting requested review from FFY00 FFY00 is a code owner
@1st1 1st1 Awaiting requested review from 1st1 1st1 is a code owner

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@nascheme
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