Then, restart your Jupyter Lab server, and make sure Jupytext is activated in Jupyter: .py and .md files have a Notebook icon, and you can open them as Notebooks with a right click in Jupyter Lab.

Jupyter Notebooks with different purposes: Social Network WebScrapping, ETL, Selenium WebDriver for Web Testing, Automation using Python, Data Wrangling, Data Transformation, Data Cleaning, Stock ...