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Python
Web App
Did this python - flask tutorial
I used SQLAlchemy python plugin to interface with an SQLite db and also used a migration app to automatically handle db changes.
Debugging
To debug, you can use PuDB, which is a nice graphical terminal program.
Virtual Environments
A virtual environment creates a python environment stored in a folder of your choosing. This allows you to install all kinds of crap not to your system, but to that virtual environment in that folder.
Virutal environments where included in python3 and to make one you run:
python3 -m venv /path/to/virtualenv/folder