python定时检查启动某个exe程序适合检测exe是否挂了

详见代码如下：

import threading 
import time 
import os 
import subprocess 
def get_process_count(imagename): 
p = os.popen('tasklist /FI "IMAGENAME eq %s"' % imagename) 
return p.read().count(imagename) 
def timer_start(): 
t = threading.Timer(120,watch_func,("is running...")) 
t.start() 
def watch_func(msg): 
print "I'm watch_func,",msg 
if get_process_count('main.exe') == 0 : 
print subprocess.Popen([r'D:\shuaji\bin\main.exe']) 
timer_start() 
if __name__ == "__main__": 
timer_start() 
while True: 
time.sleep(1)