Python中子进程Timeout的使用

#!/usr/bin/python
import signal
import select
import datetime
import subprocess
import os,sys,time
'''input: command string split list'''
def timeoutCmd(command, timeout):
    start = datetime.datetime.now()
    process = subprocess.Popen(command,stdout=subprocess.PIPE)
    while process.poll() is None:
        time.sleep(0.2)
        now = datetime.datetime.now()
        if (now - start).seconds > timeout:
            try:
                os.kill(process.pid, signal.SIGKILL)
                os.waitpid(-1, os.WNOHANG)
            except:
                pass
            return False
    return True

'''input: command string'''
def timeoutCommand(command, timeout):
    outMsg = []
    pipeFile = "timeout_%s.txt" %time.mktime(time.localtime())
    fileWriter = open(pipeFile, "w")
    cmd = command.split()
    start = datetime.datetime.now()
    process = subprocess.Popen(cmd, universal_newlines=True, stdout=fileWriter)
    while process.poll() is None:
        time.sleep(0.2)
        now = datetime.datetime.now()
        if (now - start).seconds > timeout:
            try:
                os.kill(process.pid, signal.SIGKILL)
                os.waitpid(-1, os.WNOHANG)
            except:
                pass
            break
    try:
        fileWriter.close()
        fileReaser = open(pipeFile, "r")
        outMsg = fileReaser.readlines()
        fileReaser.close()
    except:
        pass
    try:
        os.remove(pipeFile)
    except:
        pass
    return outMsg