Basic function annotation syntax

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Accepted Answer

Type annotations on parameters and return values are purely informational - Python ignores them at runtime. The function runs exactly as if the annotations weren't there: 2 + 3 = 5. The annotation 'x: int' does not prevent you from passing a string, and '-> int' does not coerce the return value. Annotations are metadata; only external tools like mypy or pyright act on them.