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Remove deprecated "N" format for Decimal#143331

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sobolevn reviewed

Jan 4, 2026

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Please, also updateDoc/whatsnew/3.15.rst to include3.18.rst

Update Doc/whatsnew/3.13.rst

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donbarbos commentedJan 4, 2026

Shouldn't this also be added to3.13 and3.14 whatsnew entries?

include pending-removal-in-3.18 to whatsnew/3.15 .rst

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sobolevn reviewed

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you updated 3.13 and 3.15, but not 3.14 :)

update 3.14

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sobolevn added needs backport to 3.13

bugs and security fixes

needs backport to 3.14bugs and security fixes labels

cpython/Modules/_decimal/_decimal.c

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January 5, 2026 10:29

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hugovk commentedJan 5, 2026

For visibility, let's also mention the removal version in the deprecation warning:

Lines 3597 to 3598 inbe0074f

	if (PyErr_WarnEx(PyExc_DeprecationWarning,
	"Format specifier 'N' is deprecated",1)<0) {

Update deprecation message

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hugovk merged commitdd750b3 intopython:main

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miss-islington-appbot commentedJan 6, 2026

Thanks@donbarbos for the PR, and@hugovk for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14.
🐍🍒⛏🤖

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miss-islington-appbot commentedJan 6, 2026

Sorry,@donbarbos and@hugovk, I could not cleanly backport this to3.14 due to a conflict.
Please backport usingcherry_picker on command line.

cherry_picker dd750b348501247d458ea8d454213d4959a8f8b9 3.14

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miss-islington-appbot commentedJan 6, 2026

Sorry,@donbarbos and@hugovk, I could not cleanly backport this to3.13 due to a conflict.
Please backport usingcherry_picker on command line.

cherry_picker dd750b348501247d458ea8d454213d4959a8f8b9 3.13

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bedevere-appbot commentedJan 6, 2026

GH-143476 is a backport of this pull request to the3.14 branch.

bedevere-appbot removed the needs backport to 3.14bugs and security fixes label

donbarbos added a commit to donbarbos/cpython that referenced this pull request

[3.14]pythongh-143331: Schedule to remove format "N" for Decimal (py…

cca7f38

…thonGH-143372)(cherry picked from commitdd750b3)Co-authored-by: Semyon Moroz <donbarbos@proton.me>

donbarbos added a commit to donbarbos/cpython that referenced this pull request

[3.13]pythongh-143331: Schedule to remove format "N" for Decimal (py…

e2b9e15

…thonGH-143372)(cherry picked from commitdd750b3)Co-authored-by: Semyon Moroz <donbarbos@proton.me>

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bedevere-appbot commentedJan 6, 2026

GH-143477 is a backport of this pull request to the3.13 branch.

bedevere-appbot removed the needs backport to 3.13bugs and security fixes label

hugovk pushed a commit that referenced this pull request

[3.14]gh-143331: Schedule to remove format "N" for Decimal (GH-143372)…

8b72c3d

… (#143476)(cherry picked from commitdd750b3)

hugovk pushed a commit that referenced this pull request