在平时使用谷歌翻译的过程中,经常会遇到需要批量翻译大量文本的情景,这种时候需要调用谷歌翻译的API
首先可以使用python库googletrans
pip install googletrans
#使用方法from googletrans import Translator translator = Translator(service_urls=['translate.google.cn']) source = '我还是不开心!'text = translator.translate(source,src='zh-cn',dest='en').text print(text)"i'm still not happy!"
但是在面对大规模需要翻译的句子时就会很慢,所以可以使用协程的方法。
这里我们使用了基于gevents库的grequests库。
仔细看了下googletrans库的核心代码,发现主要是构造一个url,然后发起get请求,得到一个json的结果,从中提取出翻译结果。
构造url的过程需要一个token,根据某些规则生成,所以为了方便还是调用googletrans的部分函数。
具体的参考代码如下:
这里是将德语(de)翻译成英语(en),代码中需要相应修改。
import grequestsimport loggingimport jsonfrom googletrans import Translatorfrom googletrans.utils import format_json headers = {'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64)'} translator = Translator(service_urls=['translate.google.cn']) logging.basicConfig(level = logging.INFO,format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s',filename='log.txt') logger = logging.getLogger()def exception_handler(request, exception): logger.warning('exception when at %s :%s',request.url,exception)def work(urls): reqs = (grequests.get(u,verify=True, allow_redirects=True, timeout=4) for u in urls) res = grequests.map(reqs, exception_handler=exception_handler,size=20) return resdef totaltranslate(): file2 = open('de2en_en.txt',mode='a',encoding='utf-8') with open('de.txt',mode='r',encoding='utf-8') as f: urls = [] num = 0 for line in f: num+=1 line = line.strip() token = translator.token_acquirer.do(line) url="https://translate.google.cn/translate_a/single?client=t&sl=de&tl=en&hl=en&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&otf=1&ssel=3&tsel=0&kc=1&tk={0}&q={1}".format(token,line) urls.append(url) if len(urls) >= 50: res = work(urls) for r in res: if hasattr(r,'status_code'): if r.status_code == 200: try: a=format_json(r.text) target = ''.join([d[0] if d[0] else '' for d in a[0]]) source = ''.join([d[1] if d[1] else '' for d in a[0]]) except Exception as e: logger.error('when format:%s',e) logger.error('%s\n%s',r.text) source = '' target = '' if len(source) != 0 and len(target) != 0: file2.write(target+'\n') else: file2.write('\n') else: file2.write('\n') urls = [] logger.info('finish 50 sentence, now at %s',num) file2.close()def sentencetranslate(line): line = line.strip() text = translator.translate(line,src='de',dest='en').text return textdef completetranslate(): file1 = open('de2en_en.txt',mode='r',encoding='utf-8') file2 = open('new_de2en_en.txt',mode='a',encoding='utf-8') i = 1 with open('de.txt',mode='r',encoding='utf-8') as f: for line in f: t = file1.readline() if len(t) == 1:#'only \n' text = sentencetranslate(line) file2.write(text+'\n') else: file2.write(t) i += 1 if i%100 == 0: print(i) file1.close() file2.close()if __name__ == "__main__": totaltranslate() completetranslate()
totaltranslate()以及翻译了大部分的句子,但是可能因为某些原因有一些句子没有翻译,所以还需要completetranslate()来补全翻译结果。
在grequests.map()中size设置为20的情况下,平均每秒翻译20句。