• Flask docs: https://flask.palletsprojects.com/en/3.0.x/
• Flask login docs: https://flask-login.readthedocs.io/en/latest/
• Using "Log in with social network": https://python-social-auth.readthedocs.io/en/latest/configuration/flask.html

Use the venv command to create a virtual environment. E.g., on Unix (see web page for how to use it on Windows and with non-Bourne-like shells):

cd 226book
python -m venv .venv  # or possibly python3
. .venv/bin/activate  # yes there's a dot at the beginning of the line
pip install -r requirements.txt

You can exit the virtual environment with the command deactivate.

flask -A headbook:app run --reload

• unknown.png – from OpenMoji (Attribution-ShareAlike 4.0 International)
• favicon.(png|ico) – from Game Icons (CC BY 3.0)
• uhtml.js – from µHTML (Copyright (c) 2020, Andrea Giammarchi, ISC License)
• Base code by Anya (Course instructor)