Hi,
You probably don't want to use raycasting. Raycasting is a specific graphics technique which is more-complicated, harder, and slower on modern hardware, though people still use it sometimes for the aesthetics it can produce. The two methods people mainly use today are "rasterization" and "raytracing".
You should understand that 3D graphics programming is fairly difficult. It's certainly doable by a complete neophyte in a semester-/year-long project, though. I recommend using raster graphics via PyOpenGL; this is, in fact, how I got my start in graphics. Here's some basecode that should get you started drawing a 3D triangle:
Ian