simple_oop_example.py

class A():
    x, y = 1, 2
    def __init__(self, a, b):
        self.a = a
        self.b = b

    def total(self):
        return self.a + self.b

class B(A):
    g = 4
    h = 5
    def __init__(self, a, b):
        super().__init__(a, b)

    def total(self):
        return self.a + self.b + 10

    def multiply(self):
        return self.a * self.b


b1 = B(7, 8)
b2 = B(9, 10)

print(b1.g) # 4
print(b2.g) # 4

b1.g = 10
B.g = 30

print(b1.g) # 10
print(b2.g) # 30

print(b1.multiply()) # 56
print(b1.total()) # 56
print(b2.multiply()) # 90