Nikita Sobolev • 12/31/2021

Python ParamSpec guide

This technical article explains the problem of typing Python decorators that alter a function's signature, particularly the return type. It details the limitations of older typing methods using TypeVar and Callable, and introduces ParamSpec (from Python 3.10/typing_extensions) as the solution. The guide includes code examples for decorators like logger and catch_exception, showing how ParamSpec preserves argument types while allowing return type modifications.

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#Python #typing #Decorators