获取配置并检查是否更改

def get_keys(self):
        '''
        获取配置并检查是否更改
        '''
        if not os.path.exists(PATH_CONFIG):
            with open(PATH_CONFIG, 'w') as F:
                F.write(CONFIG)
        else:
            config = ConfigParser.ConfigParser()
            with open(PATH_CONFIG, 'r') as cfgfile:
                config.readfp(cfgfile)
                options = config.options('key')
                for option in options:
                    option = option.upper()
                    if option in KEYS:
                        KEYS[option] = config.get('key', option)
        return KEYS