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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Can not communicate with subprocess during interpreter shutdown on windows","articleBody":"# Bug report\n\n### Bug description:\n\nIn #104826 (backported to 3.12 in #105277) to fix #104690 disallowed creating new threads during interpreter finalization.   This poses a problem on windows because the `Popen._communicate` uses a thread (see https://github.com/matplotlib/matplotlib/issues/27437#issuecomment-1840870442 for discussion).\n\nIn Matplotlib we are holding onto a latex process and triggering this via a weakref finalize, but a minimal reproducer is:\n\n```python\nfrom subprocess import Popen, PIPE\nimport atexit\n\n# anything that holds stdin and stdout should work\nproc = Popen(['powershell'], stdin=PIPE, stdout=PIPE)\n\ndef cleanup():\n    print('hi bob')\n    proc.kill()\n    proc.communicate()\n\natexit.register(cleanup)\n```\n\n\nxref https://github.com/matplotlib/matplotlib/issues/27437\n\n### CPython versions tested on:\n\n3.12\n\n### Operating systems tested on:\n\nWindows","author":{"url":"https://github.com/tacaswell","@type":"Person","name":"tacaswell"},"datePublished":"2024-02-09T14:59:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/115219/cpython/issues/115219"}