Single .py file for lesson and solution files

Currently, when I adapt anything in a lesson or solution, I need to change the corresponding lesson/solution as well. This is easy to forget, leads to incongruences and is generally not very dry, especially since the only difference between these files should be the solutions to the answers.

I wonder if there is a way to generate both the lesson notebook and solution notebook from the same `.py` file.

@JeltevanBoheemen: since you are the Keeper of Knowledge when it comes to this `.py -> .ipynb` conversion, is it possible to mark solution blocks with `# %% [solution]` and exclude them in the generation of the lesson notebooks?

Commencez par localiser le processus existant de conversion de .py-to-.ipynb et par comparer les paires de notebooks de leçon et de solution. Déterminez si les blocs de solution marqués avec # %% [solution] peuvent être exclus lors de la génération des notebooks de leçon ; c’est terminé lorsqu’une seule source .py maintient les deux sorties cohérentes.

Rédigé par le modèle d'indexation à partir du texte de l'issue.