Python爬虫有道翻译接口

import urllib.request
import urllib.parse
import json
import hashlib
from datetime import datetime
import re

while True:
    d = input('translation:\n')
    if d == 'quit':
        break
    heads = {}
    heads['User-Agent'] = 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_8; en-us) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50'

    now = datetime.now()
    now = now.timestamp()

    a = re.match(r'(\d+)\.(\d+)', str(now))
    b = a.group(1)+a.group(2)
    f = b[:13]   #时间戳前13位

    c = "rY0D^0'nM0}g5Mm1z%1G4"
    u = 'fanyideskweb'

    creatmd5 = u + d + f + c

    #生成md5
    md5 = hashlib.md5()
    md5.update(creatmd5.encode('utf-8'))
    sign = md5.hexdigest()

    url = 'http://fanyi.youdao.com/translate?smartresult=dict&smartresult=rule&sessionFrom='

    data = {}
    data['i'] = d
    data['from'] = 'AUTO'
    data['to'] = 'AUTO'
    data['smartresult'] = 'dict'
    data['client'] = 'fanyideskweb'
    data['salt'] = f
    data['sign'] = sign
    data['doctype'] = 'json'
    data['version'] = '2.1'
    data['keyfrom'] = 'fanyi.web'
    data['action'] = 'FY_BY_CLICKBUTTION'
    data['typoResult'] = 'true'

    data = urllib.parse.urlencode(data).encode('utf-8')

    req = urllib.request.Request(url=url, data=data, method='POST',headers=heads)
    #想要使用动态追加头headers，必须使Request类实例化，对象有动态追加函数req.add_headers()的方法
    response = urllib.request.urlopen(req)

    translateResult = response.read().decode('utf-8')

    target = json.loads(translateResult)

    print(target['translateResult'][0][0]['tgt'])