python使用管道获取其它进程的输出内容

 def GetLineListFromFile(sFileName):
     sCmd = "grep -i 'iphone os' " + sFileName;
     output = subprocess.Popen([sCmd],stdout=subprocess.PIPE,shell=True).communicate()
     lines = output[0].split('\n');
     return lines;
     #print (res)

 def GetLineListFromArch(sFileName):
     sCmd = "zgrep -i 'iphone os' " + sFileName;
     output = subprocess.Popen([sCmd],stdout=subprocess.PIPE,shell=True).communicate()
     lines = output[0].split('\n');
     return lines;