检查选择模块

import subprocessimport selectimport timex=subprocess.Popen(['/bin/bash','-c',"while true; do sleep 5; echo yes; done"],stdout=subprocess.PIPE)y=select.poll()y.register(x.stdout,select.POLLIN)while True:  if y.poll(1):     print x.stdout.readline()  else:     print "nothing here"     time.sleep(1)

编辑：

非posix系统的线程解决方案：

import subprocessfrom threading import Thread import timelinebuffer=[]x=subprocess.Popen(['/bin/bash','-c',"while true; do sleep 5; echo yes; done"],stdout=subprocess.PIPE)def reader(f,buffer):   while True:     line=f.readline()     if line:        buffer.append(line)     else:        breakt=Thread(target=reader,args=(x.stdout,linebuffer))t.daemon=Truet.start()while True:  if linebuffer:     print linebuffer.pop(0)  else:     print "nothing here"     time.sleep(1)