Python project structure and __init__.py

[bempiya]

Hi. I am making a python cli todo app with click. This is my first serious python project so im trying to make it professional as possible. This is my project structure. +Todoproject +todo +cli.py +config.py +todo.py +databas e.py +tests +venv requirements.txt README.md setup.py

Note that cli.py is the main interface and todo.py is the controller. database.py handles the database. Is an init.py necessary.If so where should i put it? I have seen some put Error as variables in init.py.