Is Python a good option after learning Java?

I think it will be fine, it's pretty common for developers to learn multiple languages (somewhat expected even), the only time it is likely to cause an issue is if you jump between similar languages while you are still learning the basics of them. But seeing as you already seem to feel comfortable coding in Java, and the fact that Python and Java are fundamentally quite different languages you likely won't run into that issue.

I am someone that (for better or worse) tends to constantly jump between languages when learning, and while it can cause some minor confusion from time to time once you have learned a language that knowledge tends to stick with you.

Of course this is just my personal opinion, I don't have anything but personal experience to back that opinion up, so do keep that in mind.

I'm in a similar position to yourself. I'm doing an open degree, and started Java a few years ago And hated it. I personally find it incredibly clunky and obtuse (having to write a class and 5 lines of code just to print "Hello World" doesn't fill me with joy). I did some Python through the uni as well, and couldn't understand it either, which I put down to their teaching methods (Treehouse works far better for me).

But difficulty in learning different languages? Not really. Making sure you write good notes is essential, but the main ideas behind languages will be the main thing you'll need to grasp. Java is heavily defined by being an object oriented language, Python isn't. But having knowledge of lots of different languages will always help.

Also, another advantage to learning multiple languages is you'll see commonalities, so in theory anyway, you'll be able to learn them more quickly. I dabbled a little in Unity3d, and didn't understand all of some code given (it was C I think, it was a while ago), but because it was a class and looked similar to Java, I could follow at least some of it.

If you picked up java, python should be a piece of cake.