René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"MyPy is nondeterministic across runs","articleBody":"**Bug Report**\r\nI'm observing nondeterminism in MyPy runs on one of my programs. Sometimes, it accepts a file, sometimes it doesn't. Once it has accepted a file it seems to cache this solution, and I need to wipe `.mypy_cache` to be able to reproduce the random behavior again.\r\n\r\n**To Reproduce**\r\n\r\nDownload and extract the following archive ([repro.tar.gz](https://github.com/python/mypy/files/14467193/repro.tar.gz)), which contains stubs from a library I am developing along with a `test.py` file to be checked.\r\n\r\nThis is output from an actual run on my end:\r\n```\r\n$ mypy test.py\r\ntest.py:74: error: Incompatible types in assignment (expression has type \"object\", variable has type \"Array3f\")  [assignment]\r\nFound 1 error in 1 file (checked 1 source file)\r\n\r\n$ mypy test.py\r\nSuccess: no issues found in 1 source file\r\n```\r\n\r\n\r\n**Details on setup**: mypy 1.8.0 (compiled: yes), Python 3.12.2, on an Apple M1 laptop (macOS 16.6.2). The machine is and has been perfectly stable. That is to say: I don't expect cosmic rays or RAM corruption to be responsible ;).","author":{"url":"https://github.com/wjakob","@type":"Person","name":"wjakob"},"datePublished":"2024-03-02T00:38:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/16979/mypy/issues/16979"}