记一个python中判断进程死活的方法

import os, errno

def isExist(pid):
try:
os.kill(pid, 0)
return True
except OSError, e:
if e.errno == errno.ESRCH:
return False
else
return True

http://linux.die.net/man/2/kill
1，If sig is 0, then no signal is sent, but error checking is still performed; this can be used to check for the existence of a process ID or process group ID.
2，ESRCH
The pid or process group does not exist. Note that an existing process might be a zombie, a process which already committed termination, but has not yet been wait(2)ed for