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Module « typing » Python 3.13.2

Fonction Union - module typing

Signature de la fonction Union

def Union(*args, **kwds) 

Description

help(typing.Union)

Union type; Union[X, Y] means either X or Y.

On Python 3.10 and higher, the | operator
can also be used to denote unions;
X | Y means the same thing to the type checker as Union[X, Y].

To define a union, use e.g. Union[int, str]. Details:
- The arguments must be types and there must be at least one.
- None as an argument is a special case and is replaced by
  type(None).
- Unions of unions are flattened, e.g.::

    assert Union[Union[int, str], float] == Union[int, str, float]

- Unions of a single argument vanish, e.g.::

    assert Union[int] == int  # The constructor actually returns int

- Redundant arguments are skipped, e.g.::

    assert Union[int, str, int] == Union[int, str]

- When comparing unions, the argument order is ignored, e.g.::

    assert Union[int, str] == Union[str, int]

- You cannot subclass or instantiate a union.
- You can use Optional[X] as a shorthand for Union[X, None].

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