python 多线程编程（一）

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　　传统的python单线程程序：
　　'''
Created on 2012-3-9@author: Administrator
'''
#!/usr/bin/env pythonfrom time import sleep,ctimedef loop0():print 'start loop0 at:',ctime()sleep(4)print 'loop0 done at:',ctime()def loop1():print 'start loop1 at:',ctime()sleep(2)print 'loop1 done at:',ctime()def main():print 'start  at:',ctime()loop0()loop1()print 'All done at:',ctime()if __name__=='__main__':main()运行结果：
　　start  at: Fri Mar 09 16:28:12 2012
start loop0 at: Fri Mar 09 16:28:12 2012
loop0 done at: Fri Mar 09 16:28:16 2012
start loop1 at: Fri Mar 09 16:28:16 2012
loop1 done at: Fri Mar 09 16:28:18 2012
All done at: Fri Mar 09 16:28:18 2012
可见程序是顺序执行。
　　多线程例子：
　　'''
Created on 2012-3-9
@author: Administrator
'''
#!/usr/bin/env python
import thread
from time import sleep,ctime
def loop0():
print 'start loop0 at:',ctime()
sleep(4)
print 'loop0 done at:',ctime()
def loop1():
print 'start loop1 at:',ctime()
sleep(2)
print 'loop1 done at:',ctime()
def main():
print 'start  at:',ctime()
thread.start_new_thread(loop0, ())
thread.start_new_thread(loop1, ())
sleep(6)
print 'All done at:',ctime()
if __name__=='__main__':
main()




运行结果：　　start  at: Fri Mar 09 16:35:27 2012
start loop0 at: Fri Mar 09 16:35:27 2012
start loop1 at: Fri Mar 09 16:35:27 2012
loop1 done at: Fri Mar 09 16:35:29 2012
loop0 done at: Fri Mar 09 16:35:31 2012
All done at: Fri Mar 09 16:35:33 2012可见loop0 的执行和loop1是并行的，一共三个线程：主线程、运行loop0的线程和运行loop1的线程。