46讲课后题

Tihool

import pickle
import os
class MyDes:
    def __init__(self,name):
        self.name = name
    def __get__(self,instance,owener):
        return self.name
    def __set__(self,instance,value):
        file_open = open(self.name + '.pkl','wb' )
        pickle.dump(self.name,file_open)
        file_open.close()
        self.name = value
    def __delete__(self, instance):
        file_open = open(self.name + '.pkl', 'wb')
        file_content = pickle.load(file_open)
        file_content.truncate(0)
        os.remove(file_open)
        file_open.close()
class Test:
    x = MyDes('x')
    y = MyDes('y')
test = Test()
test.x = 123
test.y = "I love FishC.com!"
print(test.x)
del test.x
错误信息TypeError: unsupported operand type(s) for +: 'int' and 'str'
应该怎么修改__delete__

python爱好者.

数字类型和字符串类型不能直接拼接，要么都转换成字符串再拼接，要么先都转换为数字......

叙白

str(self.name)， 因为你__set__里改变了self.name的值，下面test.x = 123，将123赋值给了self.name