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()