code: def prt_paths(paths, prt=sys.stdout):
          
          pat = "PATHES: {GO} L{L:02} D{D:02}\n"
          for path in paths:
              for go_obj in path:
                  prt.write(pat.format(GO=go_obj.id, L=go_obj.level, D=go_obj.depth))
              prt.write("\n")
docs: Print list of paths.