我正在测试python的继承,我有这个:
__metaclass__=type
class b:
def __init__(s):
s.hungry=True
def eat(s):
if(s.hungry):
print "I'm hungry"
else:
print "I'm not hungry"
class d(b):
def __init__(s):
super(b,s).__init__()
def __mysec__(s):
print "secret!"
obj=d()
obj.eat()
运行时错误为:
Traceback (most recent call last):
File "2.py", line 17, in ?
obj.eat()
File "2.py", line 6, in eat
if(s.hungry):
AttributeError: 'd' object has no attribute 'hungry'
我无法理解这一点,因为超级类“b”在其 init 中有s.hungry,而子类在其自己的“ init <内部调用”super“ / STRONG>” 为什么,python说“d”对象没有归因于“饥饿”?
另一个困惑:错误消息将“d”视为对象,但我将其定义为类! 我有什么不对的,如何让它发挥作用?
答案 0 :(得分:2)
class d(b):
def __init__(s):
super(d,s).__init__()
def __mysec__(s):
print ("secret!")
对于这两种用例,典型的超类调用如下所示:
> class C(B):
> def method(self, arg):
> super(C, self).method(arg)
答案 1 :(得分:1)
我想这就是你要找的东西:
__metaclass__=type
class b:
def __init__(self):
self.hungry=True
def eat(self):
if(self.hungry):
print "I'm hungry"
else:
print "I'm not hungry"
class d(b):
def __init__(self):
super(d,self).__init__()
def __mysec__(self):
print "secret!"
obj=d()
obj.eat()