While technically it can be done - you can create any kind of geometry by python command-  you really ought to look into a modeling program.  If it's something you think you may want to do more than once a year, I strongly recommend you just start out with a powerful modeler like Blender (free); if you're just going to model your sword and then not mess with making your own models again then you could try something like Sketchup.

My Freebies