Python Google Translator

google_trans.py

#!/usr/bin/python
# -*- coding:utf-8 -*-
# Usage: $echo "This is google translator." | python google_trans.py [-i <Input Language>] [-o <Output Language>] [-s]
import sys
from BeautifulSoup import BeautifulSoup
import urllib2
import urllib
import re
import getopt
import os

def google_trans(in_str, in_lang, out_lang):
    data = {'sl':in_lang,'tl':out_lang,'text': in_str}
    querystring = urllib.urlencode(data)
    request = urllib2.Request('http://www.translate.google.com' + '?' + querystring )
    request.add_header('User-Agent', 'Mozilla/5.0 (Linux; ko; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11')
    opener = urllib2.build_opener()
    feeddata = opener.open(request).read()
    soup = BeautifulSoup(feeddata)
    result = soup.find('span', id="result_box")
    ret_str = re.sub('<[^<]+?>', '', str(result))
    return ret_str.replace('&#39;', "'")

in_lang = 'en'
out_lang = 'ko'
sound = False

opts, _ = getopt.getopt(sys.argv[1:], 'i:o:s', ['input_lang=', 'output_lang='])
for opt, arg in opts:
    if opt in ('-i', '--input_lang'):
        in_lang = arg
    elif opt in ('-o', '--output_lang'):
        out_lang = arg
    elif opt == '-s':
        sound = True
out_str = google_trans(sys.stdin.read().strip(), in_lang, out_lang)
print out_str

if sound:
    os.system('wget -q -U Mozilla -O sound.mp3 "http://translate.google.com/translate_tts?ie=UTF-8&tl=' + out_lang + '&q=' + out_str + '"')
    os.system('mplayer sound.mp3')
    os.system('rm sound.mp3')