I had a couple of resources I used, CodeAcademy and a basic Python course on Udemy. As far as books I used Python Crash Course and Blackhat Python. Blackhat was more learning to write my own tools for pentesting. I also looked at a lot of the tools other folks wrote on github to see how they structured things. And I asked a lot of questions. By no means try one thing when learning Python or any language for that matter. Best advise I ever got from anyone was to write code everyday.