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What are generics and TypeVar in Python?

Q: What are generics and TypeVar in Python?

**Generics** let a function or class be **parameterized over a type** so static checkers (mypy/pyright) can preserve the relationship between inputs and outputs. A **`TypeVar`** is a placeholder for 'some specific type, consistent within this call': first(x: list[T]) -> T generic signature list[int] → T=int <text cla

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Parameterized types.

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PYA TypeVar links input element type to the return type

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