How to get SQLite working in my Flask application?

Question

I'm building a web app in Flask. I'm a noob. This is my first app.

I have followed installation instructions for SQLite, and now I have SQLite on my machine.

How do I include SQLite in my app? I need to be able to use SQLite in my app.py

Do I need to include SQLite in the virtual environment? How do I do that?

Here is the directory I'm working in