纯 Python 实现的 Google 批量翻译 [原创]
<blockquote><p>本文链接：https://www.cnblogs.com/popapa/p/google_translate.html<br>
测试通过时间：2019-8-20<br>
参阅：C#实现谷歌翻译API、Python之Google翻译爬虫</p>
</blockquote>
<p>首先声明，没有什么不良动机，因为经常会用 translate.google.cn，就想着用 Python 模拟网页提交实现文档的批量翻译。据说有 API，可是要收费。</p>
<h1 id="生成-token">生成 Token</h1>
<p>Google 为防爬虫而生成 token 的代码是 Javascript 的，且是根据网站的 TKK 值和提交的文本动态生成。更新规律未知，只好定时去取一下了。</p>
<p>网上能找到的 Python 代码大部分是去调用 PyExecJS 库，先不说执行效率的高低（大概是差一个数量级），首先是舍近求远，不纯粹，本人不喜欢。</p>
<p>好不容易找到了一段 Python 代码还有点小 Bug，且缺少动态获取 TKK 的步骤。最后还是对照 Javascript 代码自己改成 Python 了。方法很简单，先转成易懂的 Javascript，再转成 Python。Javascript 代码来自C#实现谷歌翻译API。</p>
<h2 id="原始晦涩-javascript-代码">原始（晦涩） Javascript 代码</h2>
<pre><code>var b = function (a, b) {
for (var d = 0; d < b.length - 2; d += 3) {
var c = b.charAt(d + 2),
c = "a" <= c ? c.charCodeAt(0) - 87 : Number(c),
c = "+" == b.charAt(d + 1) ? a >>> c : a << c;
a = "+" == b.charAt(d) ? a + c & 4294967295 : a ^ c
}
return a
}
var tk =function (a,TKK) {
for (var e = TKK.split("."), h = Number(e) || 0, g = [], d = 0, f = 0; f < a.length; f++) {
var c = a.charCodeAt(f);
128 > c ? g = c : (2048 > c ? g = c >> 6 | 192 : (55296 == (c & 64512) && f + 1 < a.length && 56320 == (a.charCodeAt(f + 1) & 64512) ? (c = 65536 + ((c & 1023) << 10) + (a.charCodeAt(++f) & 1023), g = c >> 18 | 240, g = c >> 12 & 63 | 128) : g = c >> 12 | 224, g = c >> 6 & 63 | 128), g = c & 63 | 128)
}
a = h;
for (d = 0; d < g.length; d++) a += g, a = b(a, "+-a^+6");
a = b(a, "+-3^+b+-f");
a ^= Number(e) || 0;
0 > a && (a = (a & 2147483647) + 2147483648);
a %= 1E6;
return a.toString() + "." + (a ^ h)
}
</code></pre>
<h2 id="易懂的-javascript-代码">易懂的 Javascript 代码</h2>
<pre><code>function RL(a, b) {
for (var d = 0; d < b.length - 2; d += 3) {
var c = b.charAt(d + 2);
c = "a" <= c ? c.charCodeAt(0) - 87 : Number(c);
c = "+" == b.charAt(d + 1) ? a >>> c : a << c;
a = "+" == b.charAt(d) ? a + c & 4294967295 : a ^ c;
}
return a
}
function TL(a,TKK) {
var e = TKK.split(".");
var h = Number(e) || 0;
var g = [];
var d = 0;
for (var f = 0; f < a.length; f++) {
var c = a.charCodeAt(f);
if (128 > c)
{
g = c;
}
else
{
if (2048 > c)
{
g = c >> 6 | 192;
}
else
{
if (55296 == (c & 64512) && f + 1 < a.length && 56320 == (a.charCodeAt(f + 1) & 64512))
{
c = 65536 + ((c & 1023) << 10) + (a.charCodeAt(++f) & 1023);
g = c >> 18 | 240;
g = c >> 12 & 63 | 128;
}
else
{
g = c >> 12 | 224;
g = c >> 6 & 63 | 128;
}
}
g = c & 63 | 128;
}
}
a = h;
for (var d = 0; d < g.length; d++) {
a += g;
a = b(a, "+-a^+6");
}
a = b(a, "+-3^+b+-f");
a ^= Number(e) || 0;
0 > a && (a = (a & 2147483647) + 2147483648);
a %= 1E6;
return a.toString() + "." + (a ^ h)
}
</code></pre>
<h2 id="python-代码">Python 代码</h2>
<pre><code>def getGoogleToken(a, TKK):
def RL(a, b):
for d in range(0, len(b)-2, 3):
c = b
c = ord(c) - 87 if 'a' <= c else int(c)
c = a >> c if '+' == b else a << c
a = a + c & 4294967295 if '+' == b else a ^ c
return a
g = []
f = 0
while f < len(a):
c = ord(a)
if 128 > c:
g.append(c)
else:
if 2048 > c:
g.append((c >> 6) | 192)
else:
if (55296 == (c & 64512)) and (f + 1 < len(a)) and (56320 == (ord(a) & 64512)):
f += 1
c = 65536 + ((c & 1023) << 10) + (ord(a) & 1023)
g.append((c >> 18) | 240)
g.append((c >> 12) & 63 | 128)
else:
g.append((c >> 12) | 224)
g.append((c >> 6) & 63 | 128)
g.append((c & 63) | 128)
f += 1
e = TKK.split('.')
h = int(e) or 0
t = h
for item in g:
t += item
t = RL(t, '+-a^+6')
t = RL(t, '+-3^+b+-f')
t ^= int(e) or 0
if 0 > t:
t = (t & 2147483647) + 2147483648
result = t % 1000000
return str(result) + '.' + str(result ^ h)
</code></pre>
<h1 id="获取-token-key">获取 Token Key</h1>
<p>Google 的 TKK 可以通过访问网站 https://translate.google.cn 获取，里面有段脚本里包含了“tkk:('xxxxxx.xxxxxx')”，用正则表达式截取即可。</p>
<pre><code> res = requests.get('https://translate.google.cn', timeout = 3)
res.raise_for_status()
result = re.search(r'tkk\:\'(\d+\.\d+)?\'', res.text).group(1)
</code></pre>
<h1 id="划分文章段落">划分文章段落</h1>
<p>因为常从 PDF 里复制文本翻译，这样就不能依赖换行符来划分段落了。只能判断空行，作为段落的分界。</p>
<p>另外 Google 返回的结果 Json 里，会以英文句点作为分隔符，每一句译文均作为数组的一项分开。所以最后得合并一下，成为一个段落。</p>
<h1 id="完整代码">完整代码</h1>
<p>代码不长，全文黏贴如下。<br>
GoogleTranslator.py：</p>
<pre><code>import requests
import re
import json
import time
class GoogleTranslator ():
_host = 'translate.google.cn'
_headers = {
'Host': _host,
'User-Agent': 'Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Mobile Safari/537.36',
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
'Accept-Language': 'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
'Accept-Encoding': 'gzip, deflate, br',
'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8',
'Referer': 'https://' + _host,
'Connection': 'keep-alive',
'Cache-Control': 'max-age=0'
}
_language = {
'afrikaans': 'af',
'arabic': 'ar',
'belarusian': 'be',
'bulgarian': 'bg',
'catalan': 'ca',
'czech': 'cs',
'welsh': 'cy',
'danish': 'da',
'german': 'de',
'greek': 'el',
'english': 'en',
'esperanto': 'eo',
'spanish': 'es',
'estonian': 'et',
'persian': 'fa',
'finnish': 'fi',
'french': 'fr',
'irish': 'ga',
'galician': 'gl',
'hindi': 'hi',
'croatian': 'hr',
'hungarian': 'hu',
'indonesian': 'id',
'icelandic': 'is',
'italian': 'it',
'hebrew': 'iw',
'japanese': 'ja',
'korean': 'ko',
'latin': 'la',
'lithuanian': 'lt',
'latvian': 'lv',
'macedonian': 'mk',
'malay': 'ms',
'maltese': 'mt',
'dutch': 'nl',
'norwegian': 'no',
'polish': 'pl',
'portuguese': 'pt',
'romanian': 'ro',
'russian': 'ru',
'slovak': 'sk',
'slovenian': 'sl',
'albanian': 'sq',
'serbian': 'sr',
'swedish': 'sv',
'swahili': 'sw',
'thai': 'th',
'filipino': 'tl',
'turkish': 'tr',
'ukrainian': 'uk',
'vietnamese': 'vi',
'yiddish': 'yi',
'chinese_simplified': 'zh-CN',
'chinese_traditional': 'zh-TW',
'auto': 'auto'
}
_url = 'https://' + _host + '/translate_a/single'
_params = {
'client': 'webapp',
'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',
'otf': '1',
'ssel': '0',
'tsel': '0',
'kc': '1'
}
__cookies = None
__googleTokenKey = '376032.257956'
__googleTokenKeyUpdataTime = 600.0
__googleTokenKeyRetireTime = time.time() + 600.0
def __init__(self, src = 'en', dest = 'zh-CN', tkkUpdataTime = 600.0):
if src not in self._language and src not in self._language.values():
src = 'auto'
if dest not in self._language and dest not in self._language.values():
dest = 'auto'
self._params['sl'] = src
self._params['tl'] = dest
self.googleTokenKeyUpdataTime = tkkUpdataTime
self.__updateGoogleTokenKey()
def __updateGoogleTokenKey(self):
self.__googleTokenKey = self.__getGoogleTokenKey()
self.__googleTokenKeyRetireTime = time.time() + self.__googleTokenKeyUpdataTime
def __getGoogleTokenKey(self):
"""Get the Google TKK from https://translate.google.cn"""
# TKK example: '435075.3634891900'
result = ''
try:
res = requests.get('https://' + self._host, timeout = 3)
res.raise_for_status()
self.__cookies = res.cookies
result = re.search(r'tkk\:\'(\d+\.\d+)?\'', res.text).group(1)
except requests.exceptions.ReadTimeout as ex:
print('ERROR: ' + str(ex))
time.sleep(1)
return result
def __getGoogleToken(self, a, TKK):
"""Calculate Google tk from TKK """
# https://www.cnblogs.com/chicsky/p/7443830.html
# if text = 'Tablet Developer' and TKK = '435102.3120524463', then tk = '315066.159012'
def RL(a, b):
for d in range(0, len(b)-2, 3):
c = b
c = ord(c) - 87 if 'a' <= c else int(c)
c = a >> c if '+' == b else a << c
a = a + c & 4294967295 if '+' == b else a ^ c
return a
g = []
f = 0
while f < len(a):
c = ord(a)
if 128 > c:
g.append(c)
else:
if 2048 > c:
g.append((c >> 6) | 192)
else:
if (55296 == (c & 64512)) and (f + 1 < len(a)) and (56320 == (ord(a) & 64512)):
f += 1
c = 65536 + ((c & 1023) << 10) + (ord(a) & 1023)
g.append((c >> 18) | 240)
g.append((c >> 12) & 63 | 128)
else:
g.append((c >> 12) | 224)
g.append((c >> 6) & 63 | 128)
g.append((c & 63) | 128)
f += 1
e = TKK.split('.')
h = int(e) or 0
t = h
for item in g:
t += item
t = RL(t, '+-a^+6')
t = RL(t, '+-3^+b+-f')
t ^= int(e) or 0
if 0 > t:
t = (t & 2147483647) + 2147483648
result = t % 1000000
return str(result) + '.' + str(result ^ h)
def translate(self, text):
if time.time() > self.__googleTokenKeyRetireTime:
self.__updateGoogleTokenKey()
data = {'q': text}
self._params['tk'] = self.__getGoogleToken(text, self.__googleTokenKey)
result = ''
try:
res = requests.post(self._url,
headers = self._headers,
cookies = self.__cookies,
data = data,
params = self._params,
timeout = 6)
res.raise_for_status()
jsonText = res.text
if len(jsonText)>0:
jsonResult = json.loads(jsonText)
if len(jsonResult)>0:
for item in jsonResult:
result += item
return result
except Exception as ex:
print('ERROR: ' + str(ex))
return ''
import time
from GoogleTranslator import GoogleTranslator
def readFile(fileName):
with open(fileName, 'r') as f:
paragraph = ''
for line in f:
if line!='\n':
paragraph += line.strip('\n')
else:
if len(paragraph)>0:
yield paragraph
paragraph = ''
if len(paragraph)>0:
yield paragraph
</code></pre>
<p>main.py：</p>
<pre><code>def main():
translator = GoogleTranslator()
count = 0
with open('C:\\dx\\python\\d.txt', 'w', encoding='utf-8') as df:
for line in readFile('C:\\dx\\python\\s.txt'):
if len(line) > 1:
count += 1
print('\r' + str(count), end = '', flush = True)
df.write(line.strip() + "\n")
result = translator.translate(line)
df.write(result.strip() + "\n\n")
if __name__ == "__main__":
startTime = time.time()
main()
print()
print('%.2f seconds' % (time.time() - startTime))
</code></pre>
<h1 id="结束语">结束语</h1>
<p>求人不如求己。不能怕烦，代码都是人敲出来的，找不到现成的还得靠自己编。</p>
<h1 id="补充">补充</h1>
<p>高版本的word（至少2016可行）能直接打开PDF文件并自动转换格式，多个换行能够自动识别合并为段落。所以以上代码可以自行修改简化。</p><br><br>
来源：https://www.cnblogs.com/popapa/p/google_translate.html
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