This code is taught and explained in my Hands-On Beginner FastAPI and SQLModel course
Make sure you're using Python 3.6 or later. In Windows you might need to execute py -V to get the version number. On a Mac try python3 -V. If they don't work, replace py or python3 below with whatever does work for you. In VS Code terminal (or whatever command line you're using), follow these steps to create a virtual environment and install dependencies.
py -m venv venv
venv\scripts\activate
pip install -r requirements.txt
python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt
When that's all done run it with the command
uvicorn main:app --reload
The browse to http://127.0.0.1:8000