python module getopt usage

 import getopt
 import sys
 def usage():
     print 'this is a usage.'
 def main():
     try:
         print sys.argv
         #sys.argv[0],表示文件路径，sys.argv[1:]，表示用户输入所有参数
         #hp:i, 带有:表示需要跟参数，后面的长参数需要带‘=’
         options,args = getopt.getopt(sys.argv[1:],"hp:i:",["help","ip=","port="])
         print 'options:',options
         print 'args:',args
     except getopt.GetoptError:
         sys.exit()

     print '--------------------'

     for name,value in options:
         if name in ("-h","--help"):
             usage()
     if name in ("-i","--ip"):
         print 'ip is----',value
     if name in ("-p","--port"):
         print 'port is----',value

 if __name__ == "__main__":
     main()