"typing.BinaryIO" missing "readinto" method

Bug report

Bug description:

typeing.BinaryIO is completely missing the readinto method. All binary mode return values of open support the readinto method, and the lack of it on the BinaryIO type makes type-hinting difficult when using this method. One could try to use io.RawIOBase | io.BufferedIOBase but this looses the fact that the result of open has a name property. This has been brought up in python/typing#659 and python/typeshed#2166.

Furthmore, the write method in BinaryIO is declared to only be compatible with Union[bytes, bytearray] when it should be anything that satisfies collections.abc.Buffer.

I propose that BinaryIO should look something more like:

class BinaryIO(IO[bytes]):
    """Typed version of the return of open() in binary mode."""

    __slots__ = ()

    @abstractmethod
    def readinto(self, b: collections.abc.Buffer) -> int:
        pass

    @abstractmethod
    def write(self, s: collections.abc.Buffer) -> int:
        pass

    @abstractmethod
    def __enter__(self) -> 'BinaryIO':
        pass

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Commencez par la définition de typing.BinaryIO et comparez-la aux valeurs de retour de open() en mode binaire, en vous concentrant sur les signatures proposées de readinto et de write compatibles avec Buffer. Vérifiez que BinaryIO expose toujours la propriété name et que le comportement mis à jour de typing est couvert par les tests existants concernés ; l’issue ne nomme aucun fichier ni test spécifique.