Improved support for Python 3.14 #8948

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hugovk merged 3 commits into python-pillow:main from radarhere:error

May 8, 2025

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radarhere commented May 8, 2025 •

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A test has started failing now that an error message has changed in Python 3.14

https://github.com/python-pillow/Pillow/actions/runs/14903027962/job/41859109942#step:11:3834

E AssertionError: Regex pattern did not match.
E Regex: 'must be sequence of length 4'
E Input: 'argument 3 must be tuple of length 4, not 2'

An error has started occurring when building PyQt6 on Python 3.14 - https://github.com/python-pillow/Pillow/actions/runs/14903027971/job/41859749652#step:8:12

Let's skip it for now.

Those changes then triggers our Windows message about unsupported Python versions - https://github.com/python-pillow/Pillow/actions/runs/14906195788/job/41869036883?pr=8948#step:28:779. Since Python 3.14 has now reached beta, we would like users to be able to install and it, so let's increment the version check.

...this then leads to the same error from building PyQt6 occurring when building Pillow - https://github.com/python-pillow/Pillow/actions/runs/14906674076/job/41870606277?pr=8948#step:28:769

LINK : fatal error LNK1104: cannot open file 'python314t.lib'


          Updated error message

c7193f7

radarhere added the Testing label


          Do not install PyQt6 on Python 3.14

71a916a

radarhere changed the title ~~Updated error message for Python 3.14~~ Improved support for Python 3.14


          Added support for Python 3.14

215069a

radarhere removed the Testing label

hugovk merged commit 3c71559 into python-pillow:main

67 of 68 checks passed

radarhere deleted the error branch

May 8, 2025 21:31

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