class A:

    @classmethod
    def m1(self):
        print('In Class A, Class Method m1.')

    def m1(self):
        print('In Class A, Method m1.')

a = A()

a.m1()
########################
def s1(x, y):
    return x*y

class A:
    @staticmethod
    def s1(x, y):
        return x + y

    def s2(self, x, y):
        return s1(x, y)

a = A()
print(a.s2(3, 7))