numpy._typing:ArrayLike

Extended Summary

Type aliases are created through the type statement

type Alias = int

In this example, Alias and int will be treated equivalently by static type checkers.

At runtime, Alias is an instance of TypeAliasType. The __name__ attribute holds the name of the type alias. The value of the type alias is stored in the __value__ attribute. It is evaluated lazily, so the value is computed only if the attribute is accessed.

Type aliases can also be generic

type ListOrSet[T] = list[T] | set[T]

In this case, the type parameters of the alias are stored in the __type_params__ attribute.

See PEP 695 for more information.