[已解决]请求帮助找报错原因,谢谢

dayu8120

class MyProperty:
    def __init__( self, fget = None, fset = None, fdel = None ):
        self.fget = fget
        self.fset = fset
        self.fdel = fdel
    def __get__(self, instance, owner):
        return self.fget(instance)
    def __set__(self, instance, value):
        self.fset(instance, value)
    def __delete__(self, value):
        self.fdel(instance)

class C:
    def __init__(self):
        self._x = None
    def getX(self):
        return self._x
    def setX(self):
        self._x = value
    def delX(self):
        del self._x
    x = MyProperty(getX, setX, delX)

>>>#运行改程序后报错
>>> c = C()
>>> c.x = "X-man"
Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    c.x = "X-man"
  File "C:/Python36/p12_7.py", line 9, in __set__
    self.fset(instance, value)
TypeError: setX() takes 1 positional argument but 2 were given
>>>

我自己也试着将self.fset(instance, value), 两个参数删掉1个,但会报错找不到参数.
实在找不出原因,请求帮助

最佳答案

月排行榜 / 总排行榜

BngThea

2017-10-13 15:40:05

在类C中的setX函数少了一个形参value

跳转到最佳答案楼层

BngThea

在类C中的setX函数少了一个形参value

了解2号

def setX(self):
        self._x = value
改为

def setX(self，value):
        self._x = value

dayu8120

BngThea 发表于 2017-10-13 15:40
在类C中的setX函数少了一个形参value

是的. 少了形参 value
改为
    def setX(self, value):
        self._x = value

同时,
&nbsp; &nbsp; def __delete__(self, value):
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;self.fdel(instance)
不应该是形参value, 而是instance
改为
&nbsp; &nbsp; def __delete__(self, instance):
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;self.fdel(instance)