閉包

 1 #閉包:內部函數調用內部函數
 2 def outer():
 3     a = 1    
 4     def inner():
 5         print(a)
 6         
 7     return inner
 8 
 9     #print(inner.__closure__)
10 inn = outer()
11 inn()
12 
13 #例子
14 
15 from urllib.request import urlopen
16 def get_url():
17     url = 'https://stock.tuchong.com/?source=extbaidudkey155&utm_source=extbaidudkey155 '
18     def get():
19         ret = urlopen(url).read()
20         print(ret)
21     return get
22 inn_func = get_url()
23 inn_func()