项目练习：百度翻译小程序

# -*- coding:utf-8 -*-
# Author:Sure Feng

import requests
import json
import sys

class BaiduFanyi(object):
    def __init__(self, trans_str):
        self.trans_str = trans_str
        self.lang_detect_url = "https://fanyi.baidu.com/langdetect"
        self.trans_url = "https://fanyi.baidu.com/basetrans"
        self.headers = {"User-Agent": "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Mobile Safari/537.36"}

    def parse_url(self, url, data):
        """解析URL地址，返回响应内容(dict 格式的)"""
        r = requests.post(url=url, data=data, headers = self.headers)
        return json.loads(r.content.decode())  # 把Json格式的字符串转换为字典

    def get_ret(self, dict_respond):
        """提取翻译结果"""
        trans_ret = dict_respond["trans"][0]["dst"]
        print("result is: ", trans_ret)

    def run(self):

        # 1 获取语言类型
        # 1.1 准备post的URL地址，data数据
        lang_detect_data = {"query": self.trans_str}
        # 1.2 发送请求，获取语言类型
        lang = self.parse_url(self.lang_detect_url, lang_detect_data)["lan"]
        # 2 准备post请求数据
        trans_data = {"query": self.trans_str, "from": "zh", "to": "en"} if lang == "zh" else 
            {"query": self.trans_str, "from": "en", "to": "zh"}
        # 3 发送请求，获取响应数据
        dict_respond = self.parse_url(self.trans_url, trans_data)
        # 4 提取翻译结果
        self.get_ret(dict_respond)

if __name__ == "__main__":
    # trans_str = sys.argv[1]
    trans_str = input("what would you want to translate>>>")
    baidu_fanyi = BaiduFanyi(trans_str)
    baidu_fanyi.run()