Method _assert_port

lib/sqlalchemy/engine/url.py:219–225

(cls, port: Optional[int])

    @classmethod
    def _assert_port(cls, port: Optional[int]) -> Optional[int]:
        if port is None:
            return None
        try:
            return int(port)
        except TypeError:
            raise TypeError("Port argument must be an integer or None")

    @classmethod
    def _assert_str(cls, v: str, paramname: str) -> str: