怎么样能够利用python实现命令行有道词典？

#!/usr/bin/env python
# -*- coding:utf-8 -*-

# API key：273646050
# keyfrom：11pegasus11

import json
import sys

try: # py3
 from urllib.parse import urlparse, quote, urlencode, unquote
 from urllib.request import urlopen
except: # py2
 from urllib import urlencode, quote, unquote
 from urllib2 import urlopen


def fetch(query_str=''):
 query_str = query_str.strip("'").strip('"').strip()
 if not query_str:
 query_str = 'python'

 print(query_str)
 query = {
 'q': query_str
 }
 url = 'http://fanyi.youdao.com/openapi.do?keyfrom=11pegasus11&key=273646050&type=data&doctype=json&version=1.1&' + urlencode(query)
 response = urlopen(url, timeout=3)
 html = response.read().decode('utf-8')
 return html


def parse(html):
 d = json.loads(html)
 try:
 if d.get('errorCode') == 0:
 explains = d.get('basic').get('explains')
 for i in explains:
 print(i)
 else:
 print('无法翻译')

 except:
 print('翻译出错，请输入合法单词')


def main():
 try:
 s = sys.argv[1]
 except IndexError:
 s = 'python'
 parse(fetch(s))


if __name__ == '__main__':
 main()