Method add

lib/sqlalchemy/util/_collections_cy.py:114–117

(self, element: _T, /)

        return new

    def add(self, element: _T, /) -> None:
        if element not in self:
            self._list.append(element)
            set.add(self, element)

    def remove(self, element: _T, /) -> None:
        # set.remove will raise if element is not in self