【Python爬虫】简单实现中英翻译器

网页分析

打开有道翻译，使用翻译功能，F12打开Network，会发现有很多get和post的数据，找到对所翻译内容请求的数据，如下图

简单分析一下header的内容

添加header的两种方式

1）通过request的header参数修改
2）通过request的add_header()方法修改

根据返回内容获取到翻译结果

实现代码

import urllib.request as req
import urllib.parse
import json

while True:
    content = input("请输入需要翻译的内容：（输入!q退出）")
    if content == '!q':
        break
    # 输入请求URL
    url = 'http://fanyi.youdao.com/translate?smartresult=dict&smartresult=rule&sessionFrom='
    '''
    添加header方法1
    head = {}
    head['User-Agent'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36'
    '''
    data = {
    
    }
    # 将请求表单以字典的形式写入data传入,i表示需要翻译的内容
    # data['i'] = '今天也是元气满满的一天呀'
    data['i'] = content
    data['from'] = 'AUTO'
    data['to'] = 'AUTO'
    data['smartresult'] = 'dict'
    data['client'] = 'fanyideskweb'
    data['salt'] = '16099982906531'
    data['sign'] = 'a9d35d5d61ef0421160b9d53b6dff04f'
    data['lts'] = '1609998290653'
    data['bv'] = '4f7ca50d9eda878f3f40fb696cce4d6d'
    data['doctype'] = 'json'
    data['version'] = '2.1'
    data['keyfrom'] = 'fanyi.web'
    data['action'] = 'FY_BY_CLICKBUTTION'
    data = urllib.parse.urlencode(data).encode('utf-8')
    request = req.Request(url, data)
    # 添加header方法2
    request.add_header('User-Agent',
                       'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36')
    response = req.urlopen(request)
    html = response.read().decode('utf-8')
    # 根据返回内容获取翻译结果
    target = json.loads(html)
    target = target['translateResult'][0][0]['tgt']
    print(target)

测试结果：

requests库和urllib库的区别