Free-threaded support?

[clin1234]

Has anyone here given thought on testing this module with the no-GIL version of the Python interpreter yet?

[mhammond]

I'm not aware of anyone looking at this. It's worth noting that there are quite a few places where the GIL is used to prevent concurrent access, so identifying these seems like the first step.

[Avasam]

As far as CI builds go, actions/setup-python#771 would be nice. But if it's somehow not available by the time pywin32 has nogil support, deadsnakes already offer a nogil python action: https://github.com/deadsnakes/action

[clin1234]

As far as CI builds go, actions/setup-python#771 would be nice. But if it's somehow not available by the time pywin32 has nogil support, deadsnakes already offer a nogil python action: https://github.com/deadsnakes/action

deadsnakes is only tested on Ubuntu

[Avasam]

As far as CI builds go, actions/setup-python#771 would be nice.

It's also possible uv gets to it first: astral-sh/uv#7193

[Avasam]

Here's a workflow manually installing Python 3.13t: #2395
It builds, but as expected, tests don't get very far:

--- Running 'D:\a\pywin32\pywin32\win32/test/testall.py' ---
*** Test script 'D:\a\pywin32\pywin32\win32/test/testall.py' exited with 3221225477
--- Running 'D:\a\pywin32\pywin32\Pythonwin/pywin/test/all.py' ---
Fatal Python error: PyWinInterpreterState_Ensure: pywintypes: can not setup interpreter state, as current state is invalid
Python runtime state: unknown

*** Test script 'D:\a\pywin32\pywin32\Pythonwin/pywin/test/all.py' exited with 3221226505
--- Running 'D:\a\pywin32\pywin32\com\win32com\test\testall.py' ---
*** Test script 'D:\a\pywin32\pywin32\com\win32com\test\testall.py' exited with 3221225477
The following scripts failed
> D:\a\pywin32\pywin32\win32/test/testall.py
> D:\a\pywin32\pywin32\Pythonwin/pywin/test/all.py
> D:\a\pywin32\pywin32\com\win32com\test\testall.py

This is unfortunately not something I'll be able to provide much help with. Contributions are more than welcome !