Doctest 在 Sphinx 中不起作用，无法导入 python 文件 Python

我在从Sphinx Tutorial开始跑doctest时遇到了问题.我有下面的目录树，但我不能运行doctest for lumache.py.如何才能使lumache.py可以导入conf.py中的pathlib函数，即sys.path.insert(0, pathlib.Path(__file__).parents[2].resolve().as_posix()).我试图执行的代码与教程中的代码相同(第一句中提到了超链接).

conf.py Contents

# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here.
import pathlib
import sys
sys.path.insert(0, pathlib.Path(__file__).parents[2].resolve().as_posix())

extensions = [
    'sphinx.ext.duration',
    'sphinx.ext.doctest',
]

...

Contents of lumache.py

def get_random_ingredients(kind=None):
    return ["shells", "gorgonzola", "parsley"]

CMD execution

C:\docs>make doctest
ModuleNotFoundError: No module named 'lumache'

Directory Tree:

docs/
├─build/
│ ├─doctest/
│ │ └─0 folder(s), 1 file(s)
│ ├─doctrees/
│ │ └─0 folder(s), 3 file(s)
│ └─html/
│   └─3 folder(s), 7 file(s)
├─make.bat
├─Makefile
└─source/
  ├─conf.py
  ├─index.rst
  ├─lumache.py
  ├─usage.rst
  ├─_static/
  │ └─0 folder(s), 0 file(s)
  └─_templates/
    └─0 folder(s), 0 file(s)