python 判断一个进程是否存在

源代码如下：

#-*- 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')