The idea is that you'll come back to this code years from now. You'll have your head full of other projects and code bases by then. You will have only a faint idea of what that old code of yours is doing and you won't remember how and why. Anything that can help you to understand your code is good.

The same reasoning applies to other developers working on your code next month. However if your Python turns out to be very far from idiomatic Python you're not helping them the slightest. You're doing harm to the team and to your career, unless everybody agree to make it the company standard and you have your back covered.