mypy-strict-kwargs
Enforce using keyword arguments where possible.
For example, if we have a function which takes two regular argument, there are three ways to call it. With this plugin, mypy will only accept the form where keyword arguments are used.
"""Showcase errors when calling a function without naming the arguments."""
def add(a: int, b: int) -> int:
"""Add two numbers."""
return a + b
_ = add(a=1, b=2) # With this plugin, ``mypy`` will only accept this form
_ = add(1, 2) # type: ignore[call-arg]
_ = add(1, b=2) # type: ignore[call-arg]Why?
In the same spirit as a formatter - think black or ruff format - this lets you stop spending time discussing whether a function call should use keyword arguments.
Sometimes positional arguments are best at first, and then more and more are added and code becomes unclear, without anyone stopping to refactor to keyword arguments.
The type checker gives better errors when keyword arguments are used. For example, with positional arguments, you may see, Argument 5 to "add" has incompatible type "str"; expected "int". This requires that you count the arguments to see which one is wrong. With keyword arguments, you get Argument "e" to "add" has incompatible type "str"; expected "int".
Installation
pip install mypy-strict-kwargsThis is tested on Python 3.11+.
Configure mypy to use the plugin
Add the plugin to your mypy configuration file:
pyproject.toml:
[tool.mypy]
plugins = [
"mypy_strict_kwargs",
]mypy.ini or .mypy.ini:
[mypy]
plugins = mypy_strict_kwargssetup.cfg:
[mypy]
plugins = mypy_strict_kwargsIgnoring functions
You can ignore functions by adding configuration to your mypy configuration file.
pyproject.toml:
[tool.mypy_strict_kwargs]
ignore_names = ["main.func", "builtins.str"]mypy.ini, .mypy.ini, or setup.cfg:
[mypy_strict_kwargs]
ignore_names = main.func, builtins.strThis is useful especially for builtins which can look strange with keyword arguments. For example, str(object=1) is not idiomatic.
To find the name of a function to ignore, set the following configuration:
pyproject.toml:
[tool.mypy_strict_kwargs]
debug = truemypy.ini, .mypy.ini, or setup.cfg:
[mypy_strict_kwargs]
debug = trueThen run mypy and look for the debug output.
1 maintainer
Metadata
1 maintainer
Release files for mypy-strict-kwargs 2026.10.19
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