def news(offset, limit=20):
    result = {}
    items = []
    category = request.args.get('category')
    keyword = request.args.get('keyword')
    if offset < 0 or limit <= 0:
        result = Result(code=Result.FAIL, msg='offset或limit参数有误!')
        return result.to_json()
    # 筛选字段,过滤 _id(ObjectId) 避免序列化异常
    column = {'_id': 0}
    # 组装查询条件,无法拼接出带模糊查询的 sql,pymongo 就是个垃圾!!!
    # condition = {}
    # if category:
    #     condition['news_web_category'] = category
    # if keyword:
    #     regex = {'$regex': '.*{}.*'.format(keyword)}
    #     condition['new_title'] = regex
    # print(condition)
    try:
        if not category and not keyword:
            items = list(mongo.collection.find({}, column).sort('news_datetime', -1).skip(offset).limit(limit))
            count = mongo.collection.find({}, column).count()
            result = PageResult(items, count=count)
        if category and not keyword:
            items = list(mongo.collection.find({'news_web_category': category}, column).sort('news_datetime', -1).skip(
                offset).limit(limit))
            count = mongo.collection.find({'news_web_category': category}, column).count()
            result = PageResult(items, count=count)
        if not category and keyword:
            items = list(
                mongo.collection.find({'news_title': re.compile(keyword, re.IGNORECASE)}, column).sort('news_datetime',
                                                                                                       -1).skip(
                    offset).limit(limit))
            count = mongo.collection.find({'news_title': re.compile(keyword, re.IGNORECASE)}, column).count()
            result = PageResult(items, count=count)
        if keyword and category:
            items = list(
                mongo.collection.find({'news_web_category': category, 'news_title': re.compile(keyword, re.IGNORECASE)},
                                      column).sort('news_datetime', -1).skip(offset).limit(limit))
            count = mongo.collection.find(
                {'news_web_category': category, 'news_title': re.compile(keyword, re.IGNORECASE)}, column).count()
            result = PageResult(items, count=count)
    except Exception as e:
        result = Result(code=Result.FAIL, msg=e)
    return result.to_json()
#     for file in filelist:
#         src_name = file.split('.')[0]
#         result = num_recog.main(os.path.join(path,file))
#         print src_name,result
#         if int(src_name) == int(result):
#             right += 1
#         else:
#             continue
#     right_rate = float(right)/len(filelist)
#     print ('rate is {}%'.format(right_rate*100))

if __name__ == "__main__":
    result = Result()
    img_type = sys.argv[1]
    img_file = sys.argv[2]
    # img_type = "file"
    # img_file = "D:/machine_learning/recognization/insurance_doc/1.jpg"
    try:
        num_recog = Number_recognition()
        predict_data = num_recog.main(img_file)
        data = {'captcha': predict_data}
        result.code = code.SUCCESS
        result.msg = "success"
        result.data = data
    except Exception, e:
        exstr = traceback.format_exc()
        logging.info('#####系统异错误error:%s', exstr)
        result.code = code.FAIL
        result.msg = sys.exc_info()
    print result.to_json()