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PEP 780: Update to use sys.abi_info #4608

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PEP 780: Update to use sys.abi_info #4608

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PEP 780: Update to use sys.abi_info
zklaus Sep 23, 2025
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Merge branch 'main' into update-pep780-w-sys-abi-info
zklaus Nov 3, 2025
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Add pyyaml fork example
zklaus Nov 2, 2025
388c7d3
Update env_var grammar specs
zklaus Nov 3, 2025
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Add details to specification and explain use w/ unknown features
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Add clarification for pyyaml example
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Merge branch 'main' into update-pep780-w-sys-abi-info
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Update peps/pep-0780.rst
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Add clarification for pyyaml example 
Co-authored-by: Michał Górny <[email protected]>
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@zklaus @mgorny
zklaus and mgorny committed Nov 4, 2025
commit 3a4baea75f95c5685459e0d7980af6ce72fca34c
9 changes: 9 additions & 0 deletions peps/pep-0780.rst
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Expand Up @@ -292,6 +292,15 @@ can be used::
pyyaml-ft; "free_threaded::True" in sys_abi_info
pyyaml; "free_threaded::True" not in sys_abi_info

Note that in the absence of the features described in this PEP, early adopting
projects have had to resort to using the fork for *all* builds of a potentially
free threading Python interpreter; typical dependencies than look like::

pyyaml; python_version<"3.13"
pyyaml-ft; python_version>="3.13"

which is an undesirable side effect for GIL-enabled environments.

Backwards Compatibility
=======================

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