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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":" `iscoroutinefunction` returns False for wrapper functions with `update_wrapper` applied","articleBody":"\u003c!--\r\n  If you're new to Python and you're not sure whether what you're experiencing is a bug, the CPython issue tracker is not\r\n  the right place to seek help. Consider the following options instead:\r\n\r\n  - reading the Python tutorial: https://docs.python.org/3/tutorial/\r\n  - posting in the \"Users\" category on discuss.python.org: https://discuss.python.org/c/users/7\r\n  - emailing the Python-list mailing list: https://mail.python.org/mailman/listinfo/python-list\r\n  - searching our issue tracker (https://github.com/python/cpython/issues) to see if\r\n    your problem has already been reported\r\n--\u003e\r\n\r\nWhen decorating a `async` function with a decorator that uses `@functools.wraps` or `update_wrapper` \r\n`inspect.iscoroutinefunction` returns False.\r\n\r\nThe following code demonstrates this issue:\r\n```python\r\nimport functools\r\nimport inspect\r\n\r\nasync def fn():\r\n    pass\r\n\r\nassert inspect.iscoroutinefunction(fn)\r\n\r\ndef decorator(fn):\r\n    def wrapper(*args, **kwargs):\r\n        return fn(*args, **kwargs)\r\n    return wrapper\r\n\r\nassert not inspect.iscoroutinefunction(decorator(fn))\r\n\r\ndef signature_preserving_decorator(fn):\r\n    @functools.wraps(fn)\r\n    def wrapper(*args, **kwargs):\r\n        return fn(*args, **kwargs)\r\n\r\n    return wrapper\r\n\r\nassert inspect.iscoroutinefunction(signature_preserving_decorator(fn))\r\n# AssertionError\r\n```\r\nI would expect the last assert statement to pass\r\n\r\n\u003c!-- Include as many relevant details as possible about the environment you experienced the bug in --\u003e\r\n\r\n- CPython versions tested on: 3.10.8\r\n- Operating system and architecture: Linux 5.19.17-2-MANJARO x86_64 GNU/Linux\r\n\r\n\u003c!--\r\nYou can freely edit this text. Remove any lines you believe are unnecessary.\r\n--\u003e\r\n","author":{"url":"https://github.com/jonasBoss","@type":"Person","name":"jonasBoss"},"datePublished":"2022-12-17T11:31:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/100317/cpython/issues/100317"}