Python3 动手自己写谷歌翻译

本篇为实现谷歌翻译的功能，在编写的时候以为只是一个接口的问题。

没想到的是每次翻译都会触发一次JS的执行，在请求参数中生成一个tk。

文中tk的实现是复用的网上大神的代码生成tk。

好了，不说了直接看代码吧！

 # /usr/bin/env python
 # -*- coding: utf- -*-
 import urllib.parse
 import execjs,requests,termcolor

 class Return_tk():

     def __init__(self):
         self.ctx = execjs.compile("""
         function TL(a) {
         var k = "";
         var b = ;
         var b1 = ;

         var jd = ".";
         var $b = "+-a^+6";
         var Zb = "+-3^+b+-f";

         for (var e = [], f = , g = ; g < a.length; g++) {
             var m = a.charCodeAt(g);
              > m ? e[f++] = m : ( > m ? e[f++] = m >>  |  : ( == (m & ) && g +  < a.length &&  == (a.charCodeAt(g + ) & ) ? (m =  + ((m & ) << ) + (a.charCodeAt(++g) & ),
             e[f++] = m >>  | ,
             e[f++] = m >>  &  | ) : e[f++] = m >>  | ,
             e[f++] = m >>  &  | ),
             e[f++] = m &  | )
         }
         a = b;
         for (f = ; f < e.length; f++) a += e[f],
         a = RL(a, $b);
         a = RL(a, Zb);
         a ^= b1 || ;
          > a && (a = (a & ) + );
         a %= 1E6;
         return a.toString() + jd + (a ^ b)
     };

     function RL(a, b) {
         var t = "a";
         var Yb = "+";
         for (var c = ; c < b.length - ; c += ) {
             var d = b.charAt(c + ),
             d = d >= t ? d.charCodeAt() -  : Number(d),
             d = b.charAt(c + ) == Yb ? a >>> d: a << d;
             a = b.charAt(c) == Yb ? a + d &  : a ^ d
         }
         return a
     }
     """)

     def getTk(self, text):
         return self.ctx.call("TL", text)

 def open_url(url):
     headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36'}
     req = requests.get(url=url, headers=headers)
     return req.content.decode('utf-8')

 def max_length(content):
     if len(content) > :
         print("翻译文本超过限制！")
         return

 def print_result(parm):
     result = parm
     str_end = result.find("\",")
     if str_end > :
         print("翻译的结果为：",result[:str_end])

 def en_to_zn_translate(content, tk):
     max_length(content)
     content = urllib.parse.quote(content)
     #英译汉
     url = "http://translate.google.cn/translate_a/single?client=t" \
           "&sl=en&tl=zh-CN&hl=zh-CN&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca" \
           "&dt=rw&dt=rm&dt=ss&dt=t&ie=UTF-8&oe=UTF-8&clearbtn=1&otf=1&pc=1" \
           "&srcrom=0&ssel=0&tsel=0&kc=2&tk=%s&q=%s" % (tk, content)
     result = open_url(url)
     print_result(result)

 def zn_to_en_translate(content,tk):
     max_length(content)
     content = urllib.parse.quote(content)
     #汉译英
     url = "http://translate.google.cn/translate_a/single?client=t"\
           "&sl=zh-CN&tl=en&hl=zh-CN&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca"\
           "&dt=rw&dt=rm&dt=ss&dt=t&ie=UTF-8&oe=UTF-8"\
           "&source=btn&ssel=3&tsel=3&kc=0&tk=%s&q=%s"%(tk,content)
     result = open_url(url)
     print_result(result)

 def main():
     js = Return_tk()
     while True:
         print(termcolor.colored("请先输入要进行的操作：q表示退出；e表示英文翻译成中文；z表示中文翻译成英文。","red"))
         change = input("请选择翻译选项：")
         if change == 'q':
             break
         elif change == 'e':
             content = input("请输入要翻译的英文：")
             tk = js.getTk(content)
             en_to_zn_translate(content,tk)
         elif change ==  'z':
             content = input("请输入要翻译的中文：")
             tk = js.getTk(content)
             zn_to_en_translate(content,tk)
         else:
             print("请输入正确的选项！")

 main()

见运行效果：

总结：

从代码上来看，写的比较简洁，没有高大上的写法，只是单纯的实现一个功能。

除了tk的生成封装成了类，其他的全部是用函数式编程实现。