面向物件（二十一）說了，描述符實現了對引數的型別檢測，如果引數非常多呢？當然可以一個一個貼上，太麻煩了。可以和裝飾器一起使用。

class Discriptor:  # 描述器
    def __init__(self, key, expected_type):
        self.key = key
        self.expected_type = expected_type

    def __get__(self, instance, owner):
        return instance.__dict__[self.key]

    def __set__
 
(self, instance, value):
        if type(value) != self.expected_type:
            print('你輸入的%s不是%s' % (value, self.type_expected))
            raise TypeError
        instance.__dict__[self.key] = value

    def __delete__(self, instance):
        pass


def decorator(**kwargs):  # 裝飾器
    def deco(obj):
        
 
for key, value in kwargs.items():  # @decorator(key=value)
            setattr(obj, key, Discriptor(key, value))  # obj.key=Discriptor(key,value) 在設定。會呼叫Discriptor.__set__
        return obj  # 別漏了return

    return deco


@decorator(name=str, age=int, gender=str)  # Test=decorator(Test)
class Test:
    
 
# name=Discriptor('name',str)
    # age=Discriptor('age',int)
    # gender=Discriptor('gender',str) #用裝飾器來批量寫入
    def __init__(self, name, age, gender):
        self.name = name
        self.age = age
        self.gender = gender


test1 = Test('蒼老師', 20, '女')
print(test1.__dict__)
test2 = Test(1111, 2, '女')