9.Python3继承顺序

# 继承顺序 mro线性顺序表
# 1.子类会优先于父类被检查
# 2.多个父类会根据他们在mro元组中的顺序被检查
# 3.如果对下一个类存在两个合法的选择，就选择第一个父类


class A:

    def test(self):
        print("A")


class B(A):

    def test(self):
        print("B")

class C(A):

    def test(self):
        print("C")


class D(B):

    def test(self):
        print("D")


class E(C):

    def test(self):
        print("E")

class F(D,E):

    def test(self):
        print("F")


f1 = F()
# 如果C不继承A
# (
# <class '__main__.F'>, <class '__main__.D'>, 
# <class '__main__.B'>, <class '__main__.A'>, 
# <class '__main__.E'>, <class '__main__.C'>, <class 'object'>
# )
# 如果C继承A
# (
# <class '__main__.F'>, <class '__main__.D'>, 
# <class '__main__.B'>, <class '__main__.E'>, 
# <class '__main__.C'>, <class '__main__.A'>, <class 'object'>
# )
print(F.__mro__)
f1.test()