Environment marker for free-threading

FFY00 · January 31, 2025, 1:51pm

I think it would make sense to essentially expand sys.abiflags into a list with proper feature/variant names, which could live in sys or sysconfig. The marker, then, would be something like 'free-threading' in sysconfig.abi_features.

Technically, we could do 't' in sys.abiflags, but we could really use proper standardized names for ABI flags — no more is it “free-threading” or “nogil”? — so we might as well take the opportunity to add this API.

Backwards compatibility wouldn’t be much of an issue, on older versions, we just translate sys.abiflags to the names chosen in the new API.

I think that’s a bundle of complexity on its own, I wonder if it wouldn’t be better off as a separate PEP.

That said, I really like the idea. We implemented something similar in Conda. Here, for example, the CUDA version is implemented as a plugin. In this case, a first-party one, but 3rd parties could do the same.

github.com/conda/conda

conda/plugins/virtual_packages/cuda.py

main

# Copyright (C) 2012 Anaconda, Inc
# SPDX-License-Identifier: BSD-3-Clause
"""Detect CUDA version."""

import ctypes
import functools
import itertools
import multiprocessing
import os
import platform
from contextlib import suppress

from .. import CondaVirtualPackage, hookimpl


def cuda_version():
    """
    Attempt to detect the version of CUDA present in the operating system.

    On Windows and Linux, the CUDA library is installed by the NVIDIA

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