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867Why type hints
868Annotating variables
869Annotating function params/returns
870Hints don't enforce
871`Optional[X]`
872Union types
873Container hints
874`tuple[int, str]`
875`tuple[int, ...]`
876`Any` type
877`Callable` hints
878`TypeAlias`
879`NewType`
880Generics with `TypeVar`
881Generic classes
882Protocols
883`Literal` types
884`TypedDict`
885`Final`
886`ClassVar`
887`Self` type
888`overload` decorator
889`mypy` introduction
890`pyright` and `pylance`

867Why type hints
868Annotating variables
869Annotating function params/returns
870Hints don't enforce
871`Optional[X]`
872Union types
873Container hints
874`tuple[int, str]`
875`tuple[int, ...]`
876`Any` type
877`Callable` hints
878`TypeAlias`
879`NewType`
880Generics with `TypeVar`
881Generic classes
882Protocols
883`Literal` types
884`TypedDict`
885`Final`
886`ClassVar`
887`Self` type
888`overload` decorator
889`mypy` introduction
890`pyright` and `pylance`

Lesson 871 of 1,289·20. Type HintsPro lesson

`Optional[X]`

X or None.

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