def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
def write(self) -> None:  # type: ignore[override]
        rval: None = super(SubmoduleConfigParser, self).write()
        self.flush_to_index()
        return rval