1 #Author : Kelvin
2 #Date : 2019/1/24 20:57
3
4 #实现目标：控制类的实例化对象时传入的参数值
5
6 #定义描述符
7 class Type():
8 def __init__(self,key,type):
9 self.key=key
10 self.type=type
11 def __get__(self, instance, owner):
12 # print("get")
13 return instance.__dict__[self.key]
14 def __set__(self, instance, value):
15 # print("set")
16 if not isinstance(value,self.type):
17 raise TypeError("%s Type is not %s"%(self.key,self.type))
18 instance.__dict__[self.key]=value
19 def __delete__(self, instance):
20 # print("delete")
21 instance.__dict__.pop(self.key)
22
23 #定义类
24 class People:
25 name=Type("name",str)
26 age=Type("age",int)
27 salary=Type("salary",float)
28 def __init__(self,name,age,salary):
29 self.name=name
30 self.age=age
31 self.salary=salary
32 p1=People("kelvin",18,12800.36)
