Mypy 1.6 Released

This page summarizes the projects mentioned and recommended in the original post on news.ycombinator.com

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  • pyright

    Static Type Checker for Python

  • Not exactly what you are looking for but maybe useful to others.

    https://github.com/microsoft/pyright/blob/main/docs/mypy-com...

  • pylyzer

    A fast static code analyzer & language server for Python

  • There's pylyzer[0], but it's in the early stages.

    [0] https://github.com/mtshiba/pylyzer

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  • pytype

    A static type analyzer for Python code

  • we've written a little bit about what pytype does differently here: https://google.github.io/pytype/

    our main focus is to be able to work with unannotated and partially-annotated code, and treat it on par with fully annotated code.

  • django-stubs

    PEP-484 stubs for Django

  • Pyright doesn't work with Django, as Django's so dynamic that it requires a plugin to infer all types correctly. Sadly, even mypy with plugins is a mess to get set up in vscode, especially if you want it to use the same config as you use for ci checks from the command line.

    We use mypy + [django-stubs](https://github.com/typeddjango/django-stubs) (in a huge Django + drf project at day job) which includes a plugin for mypy allowing it to recognize all reverse relations and manager methods. Mypy is still really rough around the edges. The cli args are poorly documented, and how they correspond to declarations in a mypy.ini / pyproject.toml is mysterious. Match-statements still have bugs even a year after release. Exclusion of untyped / partially typed files and packages we've had to solve with grep filtering mypy's output for our whitelisted set of files, as it's been unable to separate properly between errors you care about (in your own codebase) and errors in others code (dependencies, untypable dynamic python packages etc).

    The largest issue IMO is that mypy tried to adapt a java / OOP style way of type system onto python, instead of recognizing the language's real power within duck typing and passing structural types around. Typescript chose the right approach here, modelling javascript the way it is actually written, favoring structural over nominal typing, instead of the archaic and now left-behind way of Java-style OOP that has influenced mypy.

    There was a recently accepted PEP which allowed for limited dataclass transforms, enough to cover the @attr.s usecase for both mypy and pyright, but nowhere near expressive enough to cover django's models and ORM sadly. It's probably impossible / undesirable to allow for such rich plugins, so i see the future for proper pluginless typing to be more akin to how pydantic / normal dataclasses solve typing, by starting with a specification of the types, deriving its runtime implementation, instead of plugins having to reverse the type representation of a custom DSL.

  • mypy

    Optional static typing for Python

  • # is fixed: https://github.com/python/mypy/issues/12987.

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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