WMI是Windows系统的一大利器，Python的win32api库提供了对WMI的支持，安装win32api即可使用 WMI。

本例通过WMI的WQL实现ping命令。

import wmi
c = wmi.WMI()
wql = "SELECT StatusCode FROM Win32_PingStatus WHERE Address = '127.0.0.1'"

for i in c.query(wql):
  if i.StatusCode:
    print 'offline'
  else:
    print 'online'

c.query(wql)的结构如下，其中StatusCode为0表示能够ping通，大于0表示ping不通

instance of Win32_PingStatus
{
  Address = "127.0.0.1";
  BufferSize = 32;
  NoFragmentation = FALSE;
  RecordRoute = 0;
  ResolveAddressNames = FALSE;
  SourceRoute = "";
  SourceRouteType = 0;
  StatusCode = 0;
  Timeout = 1000;
  TimestampRoute = 0;
  TimeToLive = 128;
  TypeofService = 128;
};