从“兄弟”类继承？

class A:
    def method_a(self):
        print("Method A")

class B:
    def method_b(self):
        print("Method B")

class C:
    def __init__(self):
        self.a = A()
        self.b = B()

    def method_c(self):
        print("Method C")

c = C()
c.method_a()  # 输出 "Method A"
c.method_b()  # 输出 "Method B"
c.method_c()  # 输出 "Method C"