在 python 中使用不同的参数调用超类构造函数
问题描述
class A():
def __init__( self, x, y):
self.x = x
self.y = y
class B():
def __init__( self, z=0):
self.z = z
class AB(A,B):
def __init__( self, x, y, z=0):
?
如何让 AB 的构造函数使用正确的参数调用 A 和 B 的构造函数?
How can I make the constructor of AB call the constructors for A and B with the proper arguments?
我试过了
class AB(A,B):
def __init__( self, x, y, z=0):
A.__init__(x,y)
B.__init__(z)
但这给了我一个错误.
解决方案
你没有通过self.
class AB(A, B):
def __init__(self, x, y, z=0):
A.__init__(self, x, y)
B.__init__(self, z)
请注意，如果此继承层次结构变得更加复杂，您将遇到构造函数不执行或重新执行的问题.查看 super (和problems 和 super)，别忘了继承自 object 如果你在 2.x 上并且你的类没有从其他任何东西继承.
Note that if this inheritance hierarchy gets more complicated, you'll run into problems with constructors not executing or getting reexecuted. Look into super (and the problems with super), and don't forget to inherit from object if you're on 2.x and your class doesn't inherit from anything else.
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