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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"asyncio.sleep(float('nan')) does not raise ValueError","articleBody":"# Bug report\r\n`time.sleep(float('nan'))` raises `ValueError`, but `asyncio.sleep(float('nan'))` is valid and sleeps for 0. This seems bad, and `asyncio.sleep` should probably also raise `ValueError`.\r\n\r\n```python\r\nimport asyncio\r\nimport time\r\n\r\ntry:\r\n    time.sleep(float('nan'))\r\nexcept ValueError:\r\n    print(\"time.sleep raised ValueError\")\r\n\r\nasync def foo() -\u003e None:\r\n    await asyncio.sleep(float('nan'))\r\n    print(\"asyncio.sleep does not raise any error\")\r\n\r\nasyncio.run(foo())\r\n```\r\n\r\n```bash\r\n$ python foo.py\r\ntime.sleep raised ValueError\r\nasyncio.sleep does not raise any error\r\n```\r\n\r\n`time.sleep` and `asyncio.sleep` do differ in behaviour when it comes to negative numbers and changing that behaviour was considered a breaking change without strong reason: https://github.com/python/cpython/issues/83879\r\n`nan` feels like it should *very* rare to be passed intentionally, but the potential gain might also be small enough that this isn't worth fixing.\r\n\r\nRelated: https://github.com/python-trio/trio/issues/2493\r\n\r\n\r\n# Your environment\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: 3.8 to 3.11 \r\n- Operating system and architecture: `Linux 6.3.4-arch1-1`\r\n\r\n\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-105501\n* gh-105513\n* gh-105641\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/jakkdl","@type":"Person","name":"jakkdl"},"datePublished":"2023-06-05T17:08:44.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/105331/cpython/issues/105331"}