TypeAliasType

typing

class · Added in 3.12

TypeAliasType(name, value, *, type_params=(), qualname=None)

Type alias.

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. The __module__
attribute holds the name of the module in which the type alias was
defined; it can be assigned to.

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.

© Python Software Foundation. PSF License Version 2 · Official docs ↗

Members of TypeAliasType

_

__module__: The name of the module in which the type alias was defined:
__name__: The name of the type alias:
__qualname__: The qualified name of the type alias:
__type_params__: The type parameters of the type alias, or an empty tuple if the alias is not generic:
__value__: The type alias’s value.

e

evaluate_value: An evaluate function corresponding to the __value__ attribute.