python super()
http://www.cnblogs.com/lovemo1314/archive/2011/05/03/2035005.html
这篇文章介绍了super的用法，我看了这段代码不懂：
class A(object):
def __init__(self):
print "enter A"
print "leave A"
class B(object):
def __init__(self):
print "enter B"
print "leave B"
class C(A):
def __init__(self):
print "enter C"
super(C, self).__init__()
print "leave C"
class D(A):
def __init__(self):
print "enter D"
super(D, self).__init__()
print "leave D"
class E(B, C):
def __init__(self):
print "enter E"
B.__init__(self)
C.__init__(self)
print "leave E"
class F(E, D):
def __init__(self):
print "enter F"
E.__init__(self)
D.__init__(self)
print "leave F"
f = F() result:
enter F
enter E
enter B
leave B
enter C
enter D
enter A
leave A
leave D
leave C
leave E
enter D
enter A
leave A
leave D
leave F
为什么多了一层d
在输出的第六行为何多了enter d
和我想象的不一样：
C2{QYV~BBNDMBJ2W$29@9~T.jpg
文章里说，
mro中记录了一个类的所有基类的类类型序列。查看mro的记录，发觉包含7个元素，7个类名分别为：
F E B C D A object
“从而说明了为什么在C.init中使用super(C, self).init()会调用类D的初始化函数了。 ???”
代码改成：
class A(object):
def __init__(self):
print "enter A"
super(A, self).__init__() # new
print "leave A"
class B(object):
def __init__(self):
print "enter B"
super(B, self).__init__() # new
print "leave B"
class C(A):
def __init__(self):
print "enter C"
super(C, self).__init__()
print "leave C"
class D(A):
def __init__(self):
print "enter D"
super(D, self).__init__()
print "leave D"
class E(B, C):
def __init__(self):
print "enter E"
super(E, self).__init__() # change
print "leave E"
class F(E, D):
def __init__(self):
print "enter F"
super(F, self).__init__() # change
print "leave F"
f= F():
enter F
enter E
enter B
enter C
enter D
enter A
leave A
leave D
leave C
leave B
leave E
leave F
看不懂也。
立个flag
需要搞懂的有：
经典类和新式类
MRO算法
多态继承
深度优先和广度优先
