class Type:

def __init__(self, key, expect_type):

self.key = key

self.expect_type = expect_type

def __get__(self, instance, owner):

print('執行get方法')

return instance.__dict__[self.key]

def __set__(self, instance, value):

print('執行set方法')

if not isinstance(value, self.expect_type):

raise TypeError('你傳入的不是',self.expect_type)

instance.__dict__[self.key]=value

def __delete__(self, instance):

print('執行delete方法')

instance.__dict__.pop(self.key)

def deco(**kwargs): # kwargs = {'name':str, 'age': int}

def wrapper(obj): # obj = People

print('--->',kwargs)

print('類名',obj)

for key, val in kwargs.items(): # ('name',str),('age',int)

setattr(obj, key, Type(key, val))

return obj

print(kwargs)

return wrapper

@deco(name=str, age=int) # @wrapper ==> People= wrapper(People)

class People:

def __init__(self, name, age):

self.name = name

self.age = age

p = People('alex', 11)

print(p.__dict__)

總結

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