Web Reference: reveal_type and reveal_locals are handled specially by mypy during type checking, and don’t have to be defined or imported. However, if you want to run your code, you’ll have to remove any reveal_type and reveal_locals calls from your program or else Python will give you an error at runtime. Aug 6, 2025 · Struggling with Python 3.12 type hints and Mypy errors? I spent 2 weeks debugging configuration issues. Here's the exact solution that works. During this process, if mypy sees a type hint using a type that hasn't been defined yet, substitute it with a placeholder type. Once we've finished checking all the modules, check and see if there are still any placeholder types floating around.
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