我有获取当前文件的父目录的代码，这在VScode中运行时有效，但当我将代码传输到Jupyter笔记本时，它停止工作。

import pandas as pd
import os
from pathlib import Path
import matplotlib.pyplot as plt

cur_path = Path(os.path.dirname(__file__))
root_path = cur_path.parent.absolute()

train_data_path = '{}\\data\\train_codified.csv'.format(str(root_path))
test_data_path = '{}\\data\\test_codified.csv'.format(str(root_path))

这将返回以下错误：

NameError                                 Traceback (most recent call last)
Input In [1], in <cell line: 7>()
      3 from pathlib import Path
      4 import matplotlib.pyplot as plt
----> 7 cur_path = Path(os.path.dirname(__file__))
      8 root_path = cur_path.parent.absolute()
     10 train_data_path = '{}\\data\\train_codified.csv'.format(str(root_path))

NameError: name '__file__' is not defined

为什么密码在笔记本上不起作用？