類的裝飾器

def deco(obj):

obj.x = 1
obj.y = 2
return obj
@deco   #相當於foo = deco(foo)
class foo:
pass
print(foo.__dict__)
@deco    #相當於test = deco(test)
def test():
pass
print(test.__dict__)

def typed(**kwargs):

def deco(obj):
for key,value in kwargs.items():
return deco
@typed(x=1,y=2)     #先執行typed函式,返回值deco再和@組成@deco,相當於再執行foo=deco(foo)
class foo:
pass
@typed(name='alex')
def test():
pass
print(test.__dict__)   #函式的屬性字典和例項化的屬性字典都是dict型別

class typed:   #描述符(型別限制)

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 not isinstance(value,self.expected_type):
raise typeerror('%s傳入的型別不是%s'%(value,self.expected_type))
instance.__dict__[self.key] = value
def __delete__(self, instance):
print(instance.__dict__.pop(self.key))
def deco(**kwargs):    #類的裝飾器(傳字典)
for key,value in kwargs.items():
setattr(obj,key,typed(key,value))    #給movie設定屬性,key是屬性名,值是描述符
return obj
@deco(title=str,rating=int,runtime=int,budget=int,gross=int)
class movie:
def __init__(self, title, rating, runtime, budget, gross):
self.title = title
self.rating = rating
self.runtime = runtime
self.budget = budget
self.gross = gross
d1 = movie('電影名稱',456,24,100000,200000)
print(movie.__dict__)

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