:linenos:
:emphasize-lines: 1
sphinx-autobuild . _build/html
Download {download}`lesson_6_ex_3.py<./python_files/lesson_6_ex_3.py>` file and save it to your lesson folder. Below is its code.
```{literalinclude} ./python_files/lesson_6_ex_3.py
:linenos:
:emphasize-lines: 24-36
:class: important