Module « typing » Python 3.11.3

Fonction Unpack - module typing

Signature de la fonction Unpack

def Unpack(*args, **kwds) 

Description

help(typing.Unpack)

Type unpack operator.

    The type unpack operator takes the child types from some container type,
    such as `tuple[int, str]` or a `TypeVarTuple`, and 'pulls them out'. For
    example:

      # For some generic class `Foo`:
      Foo[Unpack[tuple[int, str]]]  # Equivalent to Foo[int, str]

      Ts = TypeVarTuple('Ts')
      # Specifies that `Bar` is generic in an arbitrary number of types.
      # (Think of `Ts` as a tuple of an arbitrary number of individual
      #  `TypeVar`s, which the `Unpack` is 'pulling out' directly into the
      #  `Generic[]`.)
      class Bar(Generic[Unpack[Ts]]): ...
      Bar[int]  # Valid
      Bar[int, str]  # Also valid

    From Python 3.11, this can also be done using the `*` operator:

        Foo[*tuple[int, str]]
        class Bar(Generic[*Ts]): ...

    Note that there is only some runtime checking of this operator. Not
    everything the runtime allows may be accepted by static type checkers.

    For more information, see PEP 646.