Method is_required

mypy/nodes.py:2490–2491

(self)

        return self == ARG_NAMED or self == ARG_NAMED_OPT or (star and self == ARG_STAR2)

    def is_required(self) -> bool:
        return self == ARG_POS or self == ARG_NAMED

    def is_optional(self) -> bool:
        return self == ARG_OPT or self == ARG_NAMED_OPT