[Python] Google Translate applets

A translation function is used in the project, that is, after the translation is submitted to Google, the returned results are obtained.

First, find out the context of Google translation:

Request Processing

After submitting the translation, check what the request and response are:

VcHLzOG9u7XEVVJMPC9zdHJvbmc + PC9wPgo8cD48L3A + CjxwcmUgY2xhc3M9 "brush: java;"> url = httl: // translate.google.cn/translate_a/t

The preceding submission form is shown in the following figure:

Sl = source language = en (english)

Tl = target language = zh-CN (Simplified Chinese)

And encoding method: UTF-8

Q = query = "this is a dog"

So we get our post_date

values = {'client': 't', 'sl': 'en', 'tl': 'zh-CN', 'hl': 'zh-CN', 'ie': 'UTF-8', 'oe': 'UTF-8', 'prev': 'btn',                 'ssel': '0', 'tsel': '0', 'q': text}

Check the header information again:

There is a browser, and we do not know if it is necessary. We also add a browser information:

browser = "Mozilla/5.0 (Windows NT 6.1; WOW64)"

Integrate the above information to obtain the request

values = {'client': 't', 'sl': 'en', 'tl': 'zh-CN', 'hl': 'zh-CN', 'ie': 'UTF-8', 'oe': 'UTF-8', 'prev': 'btn',                 'ssel': '0', 'tsel': '0', 'q': text}        url = "http://translate.google.cn/translate_a/t"        data = urllib.urlencode(values)        req = urllib2.Request(url, data)        browser = "Mozilla/5.0 (Windows NT 6.1; WOW64)"        req.add_header('User-Agent', browser)

Then we get the page

response = urllib2.urlopen(req)        get_page = response.read()

Response Processing

What is the response information we can see:

However, it cannot be seen that after submitting long sentences, we can know that the format returned by Google translation is: (too long to write)

[[1st sentence translation, original text, pronunciation], [second sentence translation, original text, pronunciation],...], [Other information (meaning and so on)]

Therefore, we can use the following two-step Regular Expression matching to obtain the text:

text_page = re.search('\[\[.*?\]\]', get_page).group()rex = re.compile(r'\[\".*?\",')re.findall(rex, text_page)

Finally, we find that there are additional "waits" in the text, and further replace and process them:

item = item.replace('[', "")item = item.replace('",', "")tem = item.replace('"', "")

Final program

import reimport urllibimport urllib2def translate(text):    """translate English to Chinese"""    alues = {'client': 't', 'sl': 'en', 'tl': 'zh-CN', 'hl': 'zh-CN', 'ie': 'UTF-8', 'oe': 'UTF-8', 'prev': 'btn',                 'ssel': '0', 'tsel': '0', 'q': text}    url = "http://translate.google.cn/translate_a/t"    data = urllib.urlencode(values)    req = urllib2.Request(url, data)    browser = "Mozilla/5.0 (Windows NT 6.1; WOW64)"    req.add_header('User-Agent', browser)    response = urllib2.urlopen(req)    get_page = response.read()    text_page = re.search('\[\[.*?\]\]', get_page).group()    text_list = []    rex = re.compile(r'\[\".*?\",')    for item in re.findall(rex, text_page):        item = item.replace('[', "")        item = item.replace('",', "")        item = item.replace('"', "")        text_list.append(item)    text_result = "".join(text_list)    return text_result