class Foo:
    def __init__(self, num):
        self.l = [[0]*num]*num

    def get_list(self):
        return self.l

    def update_list(self, val):
        self.l = list(map(self._add_line, self.l, [val]*len(self.l)))

    def _add_line(self, num_list, val):
        return list(map(self._add_num, num_list, [val]*len(num_list)))

    def _add_num(self, num, val):
        return num+val