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Showing content from https://github.com/KotlinIsland/basedmypy below:

KotlinIsland/basedmypy: Based Python static type checker with baseline, sane default settings and based typing features

Based Static Typing for Python

Basedmypy is a Python type checker that is built on top of the work done by the mypy project. It resolves fundamental issues, limitations and compromises that exist within Mypy and Python's type system.

Based features include:

Typesafe by default (optional and dynamic typing still supported)
Baseline functionality
Support for Intersection types
Default return type of None instead of Any
Generic TypeVar bounds
Based type-guards
Infer parameter type from default value
Infer overload types
Bare literals
Tuple literal types

See the the docs for a comprehensive list.

Also, take a look at BasedPyright, a based type checker and language server based on Pyright!

Basedmypy is installed as an alternative to, and in place of, the mypy installation:

mypy test.py

python -m mypy test.py

basedmypy was created to attempt to resolve two issues within Python and Mypy's typing ecosystem and to demonstrate new typing concepts:

Mypy is lacking numerous pieces of functionality
Pythons type system is full of deeply concerning compromises

You can find a comprehensive list of features in the docs.

If you are using vscode, we recommend the mypy extension

If you are using IntelliJ IDEA/PyCharm, we recommend the basedtyping plugin

If you are using Pydantic, we recommend pydantic-basedtyping

Basedmypy supports a feature called baseline. It allows you to adopt new strictness or features without the burden of refactoring and fixing every new error, just save all current errors to the baseline file and resolve them at what ever pace you want. Only new code will report new errors.