一:循环 忙等 子进程结束

1 import subprocess   2 import os   3 import time   4 tt = '555'   5 cmd = "python /home/100003/python/mypython/sub2.py "+" 333"+" 444 "+tt   6 print time.time()   7 sub2 = subprocess.Popen(cmd, shell=True)   8 while 1:   9     ret1 = subprocess.Popen.poll(sub2)  10     if ret1 == 0:  11         print sub2.pid,'end'  12         break  13     elif ret1 is None:  14         print  'running'  15         time.sleep(1)  16     else:  17         print sub2.pid,'term'  18         break  19 print time.time()

二:子进程结束 立即返回 使用select模块 同时可设置子进程的超时时间

1 import subprocess   2 import select   3 import time   4 import signal   5 import os   6    7 tt = '555'   8 cmd = "python /home/100003/python/mypython/sub2.py "+" 333"+" 444 "+tt   9 timeout = 3  10 pro = subprocess.Popen(cmd, stdout=subprocess.PIPE,shell = True)  11 print time.time()  12 while 1:  13     while_begin = time.time()  14     print 'timeout',timeout  15     fs = select.select([pro.stdout], [], [], timeout)  16     if pro.stdout in fs[0]:  17         tmp = pro.stdout.read()  18         print 'read', tmp  19         if not tmp:  20             print 'end'  21             print time.time()  22             break  23     else:  24         print 'outoftime'  25         print os.kill(pro.pid, signal.SIGKILL),  26         break  27     timeout = timeout - (time.time() - while_begin)