[已解决]请小伙伴分析下问题出在哪里了？

taon

源代码
import random as r

class Fish:
    def __init__(self,x,y):
        self.x = r.randint(1,10)
        self.y = r.randint(1,10)

    def move(self):
        x = x-1
        print('我的位置是:',self.x,self.y)


class Goldfish(Fish):
    pass

class Crap(Fish):
    pass

class Salmon(Fish):
    pass

class Shark(Fish):
    def __init__(self):
        self.hungry = True

    def eat(self):
        if self.hungry:
            print('我饿了,就得吃东西!')
            self.hungry = False

        else:
            print('吃饱了,不想再吃了!')：

运行结果：fish =Fish()
Traceback (most recent call last):
  File "<pyshell#181>", line 1, in <module>
    fish =Fish()
TypeError: __init__() missing 2 required positional arguments: 'x' and 'y'

传入参数之后：>>> fish = Fish(x,y)
Traceback (most recent call last):
  File "<pyshell#182>", line 1, in <module>
    fish = Fish(x,y)
NameError: name 'x' is not defined


>>> fish = Fish(r.randint(1,10),r.randint(1,10))
>>> fish.move()
Traceback (most recent call last):
  File "<pyshell#185>", line 1, in <module>
    fish.move()
  File "D:/Python34/继承关系3.py", line 9, in move
    x = x-1
UnboundLocalError: local variable 'x' referenced before assignment

最佳答案

月排行榜 / 总排行榜

gopythoner

2017-5-2 14:19:27

move函数中把
x = x-1改为self.x = self.x -1

跳转到最佳答案楼层

gopythoner

move函数中把
x = x-1改为self.x = self.x -1

taon

gopythoner 发表于 2017-5-2 14:19
move函数中把
x = x-1改为self.x = self.x -1

嗯嗯，对的，self.x 作为一个绑定的局部变量。谢谢你的帮助。