python监测当前联网状态并连接的实例

def test1():
 import os
 return1=os.system(\'ping 8.8.8.8\')
 if return1:
  print \'ping fail\'
  os.system(\'msdt.exe /id NetworkDiagnosticsNetworkAdapter\')#调用系统网络诊断
 else:
  print \'ping\'
def test2():
 import os
 import subprocess
 
 fnull = open(os.devnull, \'w\')
 return1 = subprocess.call(\'ping 8.8.8.8\', shell = True, stdout = fnull, stderr = fnull)
 if return1:
  return1 = subprocess.call(\'msdt.exe /id NetworkDiagnosticsNetworkAdapter\', shell=True, stdout=fnull, stderr=fnull)
  print \'ping fail\'
 else:
  print \'ping ok\'
 fnull.close()
 
if __name__==\'__main__\':
 test2()