# -*- coding: utf-8 -*-
"""
Created on 2016/12/5 10:21

@version: python3.5
@author: qiding
"""


class DataBase:
    def __init__(self, data_today_str):
        self.data_today_str = data_today_str

    def download(self):
        pass

    def check_valid(self):
        pass

    def merge_pre_data(self):
        pass

    def backup(self):
        pass
