def bitfield(
        self, key: KeyT, default_overflow: Optional[str] = None
    ) -> "BitFieldOperation":
        """
        Return a BitFieldOperation instance to conveniently construct one or
        more bitfield operations on ``key``.
        """
        return BitFieldOperation(self, key, default_overflow=default_overflow)

        Return a BitFieldOperation instance to conveniently construct one or
        more bitfield operations on ``key``.
        
aioredis/client.py