Print list of paths.

def prt_paths(paths, prt=sys.stdout):
        """Print list of paths."""
        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")