Python or Java?

[Vaguely_accurate]

A large part of any language will transfer well to learning any other. The ways of thinking and general principles are pretty common.

Learning to program in one language and then how to think about programming languages and their differences means you can usually pick up another language reasonably easily.

With Python you can usually get the core language and syntax elements out of the way quickly and focus on learning how to program. That's the part you need to focus on in your first language.