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OptionParser用于处理命令行参数
使用OptionPrser步骤:
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from optparse import OptionParser
parse = OptionParser()
parse.add_option("-s","--host",dest="host",help="ip地址")
parse.add_option("-p","--port",dest="port",action='store',help="端口号")
parse.add_option("-U","--username",dest="username",help="登录用户名")
parse.add_option("-P","--password",dest="password",help="登录密码")
(option,args)=parse.parse_args()