#!/usr/bin/python

#-*- coding:utf-8 -*-

import sys

reload(sys)

sys.setdefaultencoding("utf8")

import json                                                                     #导入json模块

import urllib                                                                   #导入urllib模块

from urllib2 import Request, urlopen, URLError, HTTPError                       #导入urllib2模块

def translate(inputFile, outputFile):

    fin = open(inputFile, 'r')                                              #以读的方式打开输入文件

    fout = open(outputFile, 'w')                                            #以写的方式代开输出文件

    for eachLine in fin:                                                    #按行读入文件

        line = eachLine.strip()                                         #去除每行首尾可能的空格等

        quoteStr = urllib.quote(line)                                   #将读入的每行内容转换成特定的格式进行翻译

        url = 'http://openapi.baidu.com/public/2.0/bmt/translate?client_id=WtzfFYTtXyTocv7wjUrfGR9W&q=' + quoteStr + '&from=auto&to=zh'

        try:

            resultPage = urlopen(url)                               #调用百度翻译API进行批量翻译

        except HTTPError as e:

            print('The server couldn\'t fulfill the request.')

            print('Error code: ', e.code)

        except URLError as e:

            print('We failed to reach a server.')

            print('Reason: ', e.reason)

        except Exception, e:

            print 'translate error.'

            print e

            continue

        resultJason = resultPage.read().decode('utf-8')                #取得翻译的结果，翻译的结果是json格式

        js = None

        try:

            js = json.loads(resultJason)                           #将json格式的结果转换成Python的字典结构

        except Exception, e:

            print 'loads Json error.'

            print e

            continue

        key = u"trans_result"

        if key in js:

            dst = js["trans_result"][0]["dst"]                     #取得翻译后的文本结果

            outStr = dst

        else:

            outStr = line                                          #如果翻译出错，则输出原来的文本

        fout.write(outStr.strip().encode('utf-8') + '\n')              #将结果输出

    fin.close()

    fout.close()

if __name__ == '__main__':

    translate(sys.argv[1], sys.argv[2])                                   #通过获得命令行参数获得输入输出文件名来执行，方便