又学习了一个 python 的继承。有很多帖子都有介绍，比如 理解 Python super ， python super() 。
先看一个例子，这个是第一个文章里面的。
classRoot(object): def__init__(self): print("this is Root") classB(Root): def__init__(self): print("enter B") super(B, self).__init__() print("leave B") classC(Root): def__init__(self): print("enter C") super(C, self).__init__() print("leave C") classD(C): def__init__(self): print("enter D") super(D, self).__init__() print("leave D") classE(D, B): def__init__(self): print("enter E") super(E, self).__init__() print("leave E") e = E() print(e.__class__.mro()) # results: # enter E # enter D # enter C # enter B # this is Root # leave B # leave C # leave D # leave E # [<class '__main__.E'>, <class '__main__.D'>, <class '__main__.C'>, <class '__main__.B'>, <class '__main__.Root'>, <class 'object'>]没有什么问题，所有的类都做了初始化，很完美。接着再看一个例子，这个例子其实是上面第二篇文章里面的。
classA(object): def__init__(self): print("enter A") print("leave A") classB(object): def__init__(self): print("enter B") print("leave B") classC(A): def__init__(self): print("enter C") super(C, self).__init__() print("leave C") classD(A): def__init__(self): print("enter D") super(D, self).__init__() print("leave D") classE(B, C): def__init__(self): print("enter E") super(E, self).__init__() print("leave E") classF(E, D): def__init__(self): print("enter F") super(F, self).__init__() print("leave F") f = F() print(f.__class__.mro()) # results: # enter F # enter E # enter B # leave B # leave E # leave F # [<class '__main__.F'>, <class '__main__.E'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.D'>, <class '__main__.A'>, <class 'object'>]我发现和文章里面贴的结果不一样，里面缺少对 C，D，A 的初始化。琢磨半天才弄明白，主要原因就是， A ， B 其实也是继承自 object ，然而我们并没有调用 super 来初始化，所以只需要加上就可以了。
classA(object): def__init__(self): print("enter A") super(A, self).__init__() print("leave A") classB(object): def__init__(self): print("enter B") super(B, self).__init__() print("leave B") classC(A): def__init__(self): print("enter C") super(C, self).__init__() print("leave C") classD(A): def__init__(self): print("enter D") super(D, self).__init__() print("leave D") classE(B, C): def__init__(self): print("enter E") super(E, self).__init__() print("leave E") classF(E, D): def__init__(self): print("enter F") super(F, self).__init__() print("leave F") f = F() print(f.__class__.mro()) # results: # enter F # enter E # enter B # enter C # enter D # enter A # leave A # leave D # leave C # leave B # leave E # leave F # [<class '__main__.F'>, <class '__main__.E'>, <class '__main__.B'>, <class '__main__.C'>, <class '__main__.D'>, <class '__main__.A'>, <class 'object'>]这样就完美了。目测这个会是一个隐藏的坑。