If you have finished the book from cover to cover then you probably understand more than the basics to jump on a project of your own. I didn't read it myself, so if it's not covered in the book, then understanding Object Oriented Programming in Python could be a good thing to do before moving on to a complete project, but you could totally do well with just functions, and switch to classes and objects later when you feel like your code start to get messy.
You could spend days on the official documentation to learn the ins and outs of Python, but I think it's ok to just start with what you know, and see as you go if more advanced feature could make your life easier.
It's fine to be curious about many domains, for both your enjoyment and professional life. Even as a codemonkey it is beneficial for you and your team to know more than what you should know to do your job. You really should not sweat it and hop on what makes you happy : Making a small website with Flask, fucking around with the Natural Language Toolkit, more automation, web scraping, a Discord bot, etc.