python多进程&多线程

python多进程&多线程

1.多进程定义

2.多线程

 3.应用

 3.1不使用多线程则顺序执行

 1 import logging
 2 from threading import Thread
 3 from time import sleep, ctime
 4 
 5 logging.basicConfig(level=logging.INFO)
 6 
 7 
 8 def loop0():
 9     logging.info("start loop0 at " + ctime())
10     sleep(4)
11     logging.info("end loop0 at " + ctime())
12 
13 
14 def loop1():
15     logging.info("start loop0 at " + ctime())
16     sleep(2)
17     logging.info("end loop0 at " + ctime())
18 
19 
20 def main():
21     logging.info("start all at " + ctime())
22     loop0()
23     loop1()
24     logging.info("end all at " + ctime())
25 
26 if __name__ == '__main__':
27     main()