Opens a direct message channel.

        Args:
            user (str): The user id to open a DM with. e.g. 'W1234567890'

def im_open(self, *, user: str, **kwargs) -> SlackResponse:
        """Opens a direct message channel.

        Args:
            user (str): The user id to open a DM with. e.g. 'W1234567890'
        """
        kwargs.update({"user": user})
        return self.api_call("im.open", json=kwargs)