Julien Danjou 2/25/2025

The Hidden Cost of Badly Typed Python Wrappers

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This technical article discusses the hidden dangers of incorrectly typed Python wrapper functions, particularly when using *args: Any and **kwargs: Any, which disable static type checkers like Mypy. It demonstrates the flawed pattern, explains why ParamSpec is not a solution for simple wrappers, and introduces functools.partial as the correct approach to preserve type safety and prevent runtime errors.

The Hidden Cost of Badly Typed Python Wrappers

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