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Implement PEP 803 -- abi3t #146636
Description
PEP-803 is accepted; this tracks the implementation.
- The
Py_TARGET_ABI3Tknob (and interplay withPy_LIMITED_API&Py_GIL_DISABLED): gh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension #146637 - Opaque PyObject: gh-111506: Add _Py_OPAQUE_PYOBJECT to hide PyObject layout & related API #136505
- Make
Py_mod_abimandatory: gh-146636: Py_mod_abi mandatory for modules created from slots array #146855 - Guard against GIL ABI on FT: gh-137956: Guard against non-free-threaded extensions in free-threaded builds #137957
-
importlib.machinery.EXTENSION_SUFFIXESchanges: gh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension #146637 - Reference Docs: gh-146636: PEP 803: Reference documentation #148013
- Windows python3.dll sharing between builds: Free-threaded and GIL-enabled Windows builds should share an abi3 libpython dll #148690
- Migration Docs: gh-146636: Add Free-threaded Stable ABI migration guide #150580
- Extended tests
Linked PRs
- gh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension #146637
- gh-146636: Py_mod_abi mandatory for modules created from slots array #146855
- gh-146636: PEP 803: Reference documentation #148013
- gh-146636: abi3t: Define Py_GIL_DISABLED but do not to use it #148142
- gh-146636: Improve ABI/feature selection, add new header for it #148302
- gh-146636: Add Free-threaded Stable ABI migration guide #148453
- gh-146636: Add Free-threaded Stable ABI migration guide #150580
- [3.15] gh-146636: Add Free-threaded Stable ABI migration guide (GH-150580) #150844
Activity
neutrinoceros commentedon Mar 30, 2026
@encukou congratz ! Although I think there's a typo in the title and description; you mean PEP 803, right ?
[-]Implement PEP 809 -- abi3t[/-][+]Implement PEP 803 -- abi3t[/+]gh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension (GH-1…
gh-146636: Py_mod_abi mandatory for modules created from slots array (G…
pythongh-146636: abi3t: Define Py_GIL_DISABLED but make sure not to u…
pythongh-146636: abi3t: Define Py_GIL_DISABLED but make sure not to u…
gh-146636: abi3t: Define Py_GIL_DISABLED but do not use it (GH-148142)
pythongh-146636: abi3t: Test that Python.h avoids checking Py_GIL_DIS…
clin1234 commentedon Apr 12, 2026
For
Migration Docs, it would be suitable to document adapting to this PEP as a separate HOWTO, is it not?encukou commentedon Apr 13, 2026
Yes. I'll to do it when the situation around
PyCriticalSectionis clearer.gh-146636: PEP 803: Reference documentation (GH-148013)
18 remaining items
pythongh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension (…
pythongh-146636: Py_mod_abi mandatory for modules created from slots …
pythongh-146636: abi3t: Define Py_GIL_DISABLED but do not use it (pyt…
pythongh-146636: PEP 803: Reference documentation (pythonGH-148013)
pythongh-146636: Improve ABI/feature selection, add new header for it (…
👷 ci(build): ship cp315t wheels
✨ feat(build): support free-threaded Python wheels (#307)
ngoldbaum commentedon Jun 1, 2026
gh-146636: Add Free-threaded Stable ABI migration guide (GH-150580)
[3.15] gh-146636: Add Free-threaded Stable ABI migration guide (GH-15…
pythongh-146636: Add Free-threaded Stable ABI migration guide (python…
vstinner commentedon Aug 5, 2026
Congrats! That's a great achievement for Python 3.15 and Free Threading!
encukou commentedon Aug 6, 2026
Race conditions for everyone! 🏁