python裝飾器練習

1、編寫裝飾器，為多個函式加上認證功能(使用者的賬戶密碼**檔案)

要求登入成功一次，後續的函式都無需再輸入使用者名稱和密碼

flag =false

deflogin(func):
def inner(*args,**kwargs):
global
flag
"""登入程式
"""if
flag:
ret = func(*args,**kwargs)
return
ret 
else
: username = input('
you name: ')
password = input('
you password:')
if username == 'dj'
and password == '
123'
: flag =true
ret = func(*args, **kwargs)
return
ret 
else
: 
print('
logining error')
return
inner
@login 
#shoplistadd = login(shoplistadd)
defshoplistadd():
print('
增加物品')
@login
defshoplistdel():
print('
刪除物品')
shoplistadd()
shoplistdel()

2、編寫裝飾器，為多個函式加上記錄呼叫功能，要求每次呼叫函式都將被呼叫的函式名稱寫入檔案

def

log(func):
def inner(*args,**kwargs):
with open(
'log
',mode='
a',encoding='
utf-8
') as f:
f.write(func.
__name__+'\n'
) ret = func(*args,**kwargs)
return
ret 
return
inner
@log 
#shoplistadd = log(shoplistadd)
defshoplistadd():
print('
增加一件物品')
@log 
#shoplistdel = log(shoplistdel)
defshoplistdel():
print('
刪除一件物品')
shoplistadd()
shoplistdel()

import

osfrom urllib.request import
urlopen
defcache(func):
def inner(*args,**kwargs):
if os.path.getsize('
web_cache'):
with open(
'web_cache
','rb
') as f:
return
f.read()
ret = func(*args,**kwargs) #
get()
with open('
web_cache
','wb
') as f:
f.write(b
'*********
'+ret)
return
ret 
return
inner
@cache
defget(url):
code =urlopen(url).read
return
code
ret = get('
')print(ret)

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