import urllib.request
import urllib.parse

#通過抓包的方式獲取post的url，並不是瀏覽器位址列的url
url = "http://fanyi.youdao.com/translate?smartresult=dict&smartresult=rule"
#使用者介面輸入
key=input("請輸入需要翻譯的文字:")
#傳送到web伺服器的表單資料
formdata ={
    "i": key,
    "from": "AUTO",
    "to": "AUTO",
    "smartresult": "dict",
    "client": "fanyideskweb",
    "salt": "1537698317221",
    "sign": "b569c8bf54bf1b0d71725726e7c1a5",
    "doctype": "json",
    "version": "2.1",
    "keyfrom": "fanyi.web",
    "action": "FY_BY_REALTIME",
    "typoResult": "false"
    }
#headers
headers={ "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36"}
#經過urlencode轉碼
data = urllib.parse.urlencode(formdata).encode(encoding='gbk')
#如果Request（）方法裡的data引數裡有值，那麼這個請求就是post
#如果沒有，則是get請求
request = urllib.request.Request(url,data=data, headers = headers)

repost = urllib.request.urlopen(request)

html=repost.read().decode("utf-8")
print(html)