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Python 3 introduced the idea of "type annotations," and as of Python 3.6, you can annotate variables, not just function parameters and return values. The idea is that you can put a colon (:) and then ...
This function takes two parameters: ... Pyrefly and Ty: Two new Rust-powered Python type-checking tools compared. Jun 25, 2025 5 mins. how-to. Get started with Python type hints.