Mypy can work really well in many cases, but we seem to get bitten by bugs on a daily/weekly basis. There are >1,000 currently open on Github [0], so it doesn't take much effort to hit one. And having the type-checker tell you that something's not valid when it actually is is a real turn-off...means that we end up with code that's riddled with "# type: ignore", which kind of defeats the point.Pylance (the VSCode built-in linter, based on Pyright I believe) tends to do a better job than Mypy, but not as easy to integrate into CI. It's a real shame that the Python ecosystem doesn't have anything nearly as robust as TypeScript.
[0] https://github.com/python/mypy/issues?q=is%3Aopen+is%3Aissue...
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