python 实时获取子进程输出

在论坛上找到方法了，http://bbs.csdn.net/topics/340234292 

import subprocess def main():    process1 = subprocess.Popen("python  -u sub.py", shell=False, stdout = subprocess.PIPE, stderr=subprocess.STDOUT)            #print process1.communicate()[0]     while True:        line = process1.stdout.readline()        if not line:            break        print line     if __name__ == '__main__':    main()

import subprocessimport time p = subprocess.Popen('ping 127.0.0.1 -n 10', stdout=subprocess.PIPE)while p.poll() == None:    print p.stdout.readline()    time.sleep(1)print p.stdout.read()   print 'returen code:', p.returncode