類的裝飾器

類的裝飾器

#

def deco(func):
#print('**********')
#return func##
# @deco #test=deco(test)
## def test():
## print('test函式執行')
## test()##
@deco #foo=deco(foo)
#class foo:
#pass
defdeco(obj):
print('
**********
',obj)
obj.x=1obj.y=2obj.z=3
return
obj#
@deco #foo=deco(foo)
#class foo:
#pass##
print(foo.__dict__)
#一切皆物件
## @deco #test=deco(test)
#def test():
#print('test函式')
#test.x=1
#test.y=1
#print(test.__dict__)

修訂版

def typed(**kwargs):

defdeco(obj):
for key,val in
kwargs.items():
#obj.key=val
setattr(obj,key,val)
return
obj 
return
deco
@typed(x=1,y=2,z=3) #
1.typed(x=1,y=2,z=3) --->deco 2.@deco---->foo=deco(foo)
class
foo:
pass
print(foo.__dict__)#
@typed(name='egon') #@deco ---->bar=deco(bar)
#class bar:
#pass
#print(bar.name)

類裝飾器的應用

class

typed:
def__init__
(self,key,expected_type):
self.key=key
self.expected_type=expected_type
def__get__
(self, instance, owner):
print('
get方法')
#print('instance引數【%s】' %instance)
#print('owner引數【%s】' %owner)
return instance.__dict__
[self.key]
def__set__
(self, instance, value):
print('
set方法')
#print('instance引數【%s】' % instance)
#print('value引數【%s】' % value)
#print('====>',self)
ifnot
isinstance(value,self.expected_type):
#print('你傳入的型別不是字串，錯誤')
#return
raise typeerror('
%s 傳入的型別不是%s
' %(self.key,self.expected_type))
instance.
__dict__[self.key]=value
def__delete__
(self, instance):
print('
delete方法')
#print('instance引數【%s】' % instance)
instance.__dict__
.pop(self.key)
def deco(**kwargs): #
kwargs=
obj=people
for key,val in kwargs.items():#
(('name',str),('age',int))
setattr(obj,key,typed(key,val))
#setattr(people,'name',typed('name',str)) #people.name=typed('name',str)
return
obj 
return
@deco(name=str,age=int) #
class
people:
name='
alex'#
name=typed('name',str)
#age=typed('age',int)
def__init__
(self,name,age,salary,gender,heigth):
self.name=name
self.age=age
self.salary=salary
#p1=people('213',13.3,13.3,'x','y')
print(people.__dict__)

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