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Using Mypy in Production
11 projects | news.ycombinator.com | 22 Aug 2022
I am moving all my open source projects to `mypy --strict`. Here's the diff of adding basic / --strict mypy types:
libvcs: https://github.com/vcs-python/libvcs/pull/362/files, https://github.com/vcs-python/libvcs/pull/390/files
libtmux: https://github.com/tmux-python/libtmux/pull/382/files, https://github.com/tmux-python/libtmux/pull/383/files
unihan-etl: https://github.com/cihai/unihan-etl/pull/255/files, https://github.com/cihai/unihan-etl/pull/257/files
As for return on investment - not sure yet. What I like about it is:
- completions (through annotating)
- typings can be used downstream (since the above are all now typed python libraries)
- maintainability and bug finding. Easy to wire into CI and run locally.
There's a thread on mypy, "--strict is too strict to be useful", https://github.com/python/mypy/issues/7767. I'm not sure if I walked away with that impression. If I have a function that could potentially return `None` (`Optional[str]` or `str | None`) - it makes sense for the user to handle such a case. They could:
assert response is not None
libvcs 0.14 - Python library for VCS systems supporting Git / Mercurial / Subversion (Dusting this off after a few years of inactivity, wow is mypy nice)
2 projects | /r/Python | 1 Aug 2022
GitHub (docs) - Git URL parser, commands, project syncing
What are some alternatives?
pymorphy2 - Morphological analyzer / inflection engine for Russian and Ukrainian languages.
libtmux - ⚙️ Python API / wrapper for tmux