@staticmethod
def set_access_key(config_dict, key_id, key_secret):
    """set id and secret of config's default access key"""
    if 'access_key' in config_dict:
        print('Existing access key overwritten.')
    else:
        print('Access key set.')
    config_dict['access_key'] = {key_id: key_secret}
    return config_dict
