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GeezerVison is showing github.com — gh-68656: Pass CO_* constants for inspect from C; deprecate CO_NOFREE by encukou · Pull Request #159461 · python/cpython

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@encukou

@encukou encukou commented Oct 15, 2026

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The constants were redefined in dis.py, and not perfectly kept in sync: inspect.CO_NOFREE was kept even though the C define went away in gh-26839.

  • Expose the constants via _opcode (as agreed in Expose C level compiler flag constants to Python code #68656) and its wrapper opcode. This removes CO_NOFREE from dis.COMPILER_FLAG_NAMES.
  • Re-add, deprecate and document inspect.CO_NOFREE

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@encukou
pythongh-68656: Pass CO_* constants for inspect from C; deprecate CO_…
4db80fe 
…NOFREE

The constants were redefined in dis.py, and not perfectly kept in
sync: inspect.CO_NOFREE was kept even though the C define went away
in pythongh-26839.

- Expose the constants via `_opcode` (as agreed in pythongh-68656)
  and its wrapper `opcode`.
  This removes `CO_NOFREE` from `dis.COMPILER_FLAG_NAMES`.
- Re-add, deprecate and document inspect.CO_NOFREE
@encukou
encukou requested review from AA-Turner and willingc as code owners October 15, 2026 13:01
@bedevere-app bedevere-app Bot added the type-feature A feature request or enhancement label Oct 15, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Oct 15, 2026
Expose C level compiler flag constants to Python code #68656
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@bedevere-app bedevere-app Bot added the awaiting core review label Oct 15, 2026
@read-the-docs-community

read-the-docs-community Bot commented Oct 15, 2026

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Documentation build overview

📚 cpython-previews | 🛠️ Build #35166956 | 📁 Comparing 4db80fe against main (637fb36)

  🔍 Preview build  

10 files changed · ± 10 modified

± Modified

  • deprecations/index.html
  • deprecations/pending-removal-in-3.21.html
  • library/inspect.html
  • reference/datamodel.html
  • whatsnew/3.12.html
  • whatsnew/3.13.html
  • whatsnew/3.14.html
  • whatsnew/3.15.html
  • whatsnew/3.16.html
  • whatsnew/changelog.html
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@AA-Turner AA-Turner Awaiting requested review from AA-Turner AA-Turner is a code owner
@willingc willingc Awaiting requested review from willingc willingc is a code owner

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@encukou
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