{python} {字符串格式}

    tf_mdl_dir = 'data/20180402-114759'
    data_name = 'vggface2'

    state_dict = mdl.state_dict()

    torch.save(state_dict, f'{tf_mdl_dir}-{data_name}.pt')   


# VS
 
   model_name = '{}-{}.pt'.format(tf_mdl_dir, data_name)

   #PS: 还是后一种比较简明易懂