没有足够的参数传递给__init __（）

Question

下面的错误是什么？另外，有没有更好的方法来实现以下类？

     #!/usr/bin/python

     class Datacenters:
        def __init__(self,name,location,cpu,mem):
           self.name=name
           self.location=location
           self.cpu=cpu
           self.mem=mem

        def  getparam(self):
           return self.name,self.location ,self.cpu,self.mem

        def  getname(self):
           return self.name

     class WS(Datacenters):
        def __init__(self,name,location,cpu,mem,obj):
           #datacentername = Datacenters.__init__(self) #To which data center it is associated
           self.dcname =obj.name #To which data center it is associated

           Datacenters.__init__(obj,name,location,cpu,mem)

        def getparam(self,obj):
           self.name,self.location ,self.cpu,self.mem = obj.getparam()
           print self.dcname
           #return self.name,self.location ,self.cpu,self.mem,obj.name

        def  getwsname(self):
           return self.name

     class Pcs(WS):
        def __init__(self,name,location,cpu,mem,obj):
           self.wsname = obj.getwsname() #To which WS it is  associated
           WS.__init__(obj,name,location,cpu,mem)

        def  getparam(self,obj):
           print obj.getparam()
           print self.wsname


     a = Datacenters("dc1","Bl1",20,30)
     print a.getparam()
     b = WS("WS1","Bl1",21,31,a)
     print b.getparam(a)
     c = Pcs("PC1","Bl1",20,30,b)
     #print c.getparam(b)

输出：

   Press ENTER or type command to continue 
   ('dc1', 'Bl1', 20, 30)
   dc1
   None
   Traceback (most recent call last):
   File "class1.py", line 45, in <module>
   c = Pcs("PC1","Bl1",20,30,b)
   File "class1.py", line 34, in __init__
   WS.__init__(obj,name,location,cpu,mem)
   TypeError: __init__() takes exactly 6 arguments (5 given)

Answer 1

错误是您传递了五个参数，但__init__需要六个参数。算上他们：

def __init__(self,name,location,cpu,mem,obj):

六个论点。你这样称呼它：

WS.__init__(obj,name,location,cpu,mem)

五个论点。第一个，self丢失了。您应该问自己的原因是为什么您不必一直传递六个参数。

这是因为当您在实例上调用方法时会自动传入self。但是，在这种情况下，您不会在实例上调用它，而是直接在类上调用它。在这种情况下当然没有必要这样做，正确的语法是：

WS(obj,name,location,cpu,mem)

正如你上面确实注意到的那样。