python如何判断一个进程是否存在

#-*- coding:utf-8 -*-

def check_exsit(process_name):

import win32com.client

WMI = win32com.client.GetObject('winmgmts:')

processCodeCov = WMI.ExecQuery('select * from Win32_Process where Name="%s"' % process_name)

if len(processCodeCov) > 0:

    print '%s is exists' % process_name

else:

    print '%s is not exists' % process_name

if __name__ == '__main__':

check_exsit('chrome.exe')