# # -*- coding: UTF-8 -*-
# 多继承中：子类的对象调用一个方法，默认就近原则
# 新式类中：广度优先
# 经典类：深度优先
# python2.7 新式类和经典类共存，新式类要继承object
# python3   只有新式类，默认继承object
# 经典类和新式类还有一个区别：mro方法只在新式类中存在 super 只在python3中存在
# super本质：不是直接父类，而是根据调用者的节点位置广度优先顺序来
class A:
    def func(self):print('A')
class B(A):pass
    #def func(self):print('B')
class C(A):
    def func(self):print('C')
class D(B,C):pass
    #def func(self):print('D')
d = D()
d.func()
print('-----------------------------------------')
class A:
    def func(self):print('A')
class B(A):pass
    #def func(self):print('B')
class E:
    def func(self):print('E')
class C(E):#pass
    def func(self):print('C')
class D(B,C):pass
    #def func(self):print('D')
d = D()
d.func()
print('-----------------------------------------')
class F:
    def func(self):print('F')
class A(F):pass
    #def func(self):print('A')
class B(A):pass
    #def func(self):print('B')
class E(F):#pass
    def func(self):print('E')
class C(E):pass
    #def func(self):print('C')
class D(B,C):pass
    #def func(self):print('D')
d = D()
d.func()
print(D.mro())


#super本质：不是直接父类，而是根据调用者的节点位置的广度优先顺序来的
class A:
    def func(self):
        print('A')#9
class B(A):
    def func(self):#5
        super().func()#6
        print('B')#11
class C(A):
    def func(self):#7
        super().func()#8
        print('C')#10
class D(B,C):
    def func(self): #3
        super().func()#4
        print('D')#12
d = D() #1
d.func()#2