Python 入门demo第二篇

循环执行逻辑
 1 #-*- coding: UTF-8 -*-
 2 import time
 3 import urllib2
 4 
 5 
 6 def task(i):
 7     urlstr='http://baidu.com'
 8     html = urllib2.urlopen(urlstr,timeout=30).read()
 9     # -*- coding: UTF-8 -*-
10     print '第',str(i),'次'
11 
12 def tasking(j):
13     urlstr = 'http://baidu.com'
14     html = urllib2.urlopen(urlstr,timeout=30).read()
15     print '第',str(j),'次'
16 
17 def timer(n):
18     i=0;
19     j=0;
20     while True:
21         print time.strftime('%Y-%m-%d %X', time.localtime())
22         i+=1
23         j+=1
24         task(i)
25         tasking(j)
26         time.sleep(n)
27 
28 
29 if __name__ == '__main__':
30     timer(300)