Jupyter笔记本中的Surface %% bash错误

Question

我有一些Jupyter笔记本，我想作为自动化测试运行。我可以通过运行jupyter nbconvert --execute Test.ipynb从命令行执行此操作（有更好的方法吗？），如果任何Python单元格引发异常，它将引发异常。我也可以使用python API，它看起来像这样：

import nbformat
from nbconvert.preprocessors import ExecutePreprocessor
from nbconvert.preprocessors.execute import CellExecutionError

with open(notebook_filename, 'r') as f:
    nb = nbformat.read(f, as_version=4)

ep = ExecutePreprocessor(kernel_name='python3')
try:
    out = ep.preprocess(nb, {'metadata': {'path': './'}})
except CellExecutionError as e:
    raise Exception('Python notebook %s failed with error: %s' % (notebook_filename, e))

但是，如果我的笔记本包含一个bash单元格，例如......

%%bash 
python test.py

...如果在子进程中运行的python脚本引发了异常，则此异常不会显示在命令行中。可以肯定的是，该例外由笔记本注册并显示，例如

Traceback (most recent call last):   File "test.py", line 1, in <module>
    raise Exception('wat') Exception: wat

但是通过终端或python API调用它不会产生错误：

$ jupyter nbconvert --execute notebooks/Test.ipynb
[NbConvertApp] Converting notebook notebooks/Test.ipynb to html
[NbConvertApp] Executing notebook with kernel: python3
[NbConvertApp] Writing 249850 bytes to notebooks/Test.html

如何让Jupyter表现出这些错误？