Feature or enhancement

Proposal:

Currently, the sys.abiflags attribute is only set on Unix systems. On Windows, there are no sys.abiflags set (i.e. hasattr(sys, 'abiflags') -> False). It is hard to tell if Python is in free-threaded or debug builds. Although developers can use something like sysconfig.get_config_var('Py_GIL_DISABLED'). It is not well documented and is not convenient.

It would be nice if we could set ABIFLAGS in pyconfig.h and enable sys.abiflags on Windows. This would simplify much code in the wild world and also in the CPython repo.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-127405: Set sys.abiflags on Windows #127406
• gh-127405: Emit a deprecation warning about a future change of sys.abiflags availability on Windows #131717
• gh-127405: Add ABIFLAGS to sysconfig.get_config_vars() on Windows #131799
• gh-127405: Remove dead code in sysconfig._get_pybuilddir() #131935