Answer 1

First, Python is very slow to be used in video game development. You can opt for C#, look for Hytale, it's a Minecraft style game and even better than it's being developed with C#.

Second, learn OpenGL, with that you have what it takes to make a 3D video game.

Answer 2

If you still want to stick with Python, look at this:
https://www.panda3d.org/

Answer 3

You can use Java game Library