Well, sort of. Pygame itself is more C than Python.

Everything they build on top of that should be able to be pure Python, though, which is pretty nifty.

I didn't know it was possible to obtain a hardware-accelerated OpenGL context without using GLX. How does it work without X11? Can I draw to the screen without any dependencies?

Probably the same way Wayland or the original Raspberry Pi drivers do it, using EGL.