code: def wr_txt(self, fout_txt="gos_depth01.txt", title=None):
          
          with open(fout_txt, 'w') as prt:
              self.prt_header(prt, title)
              data_nts = self.prt_txt(prt)
              sys.stdout.write("  {N:>5} items WROTE: {TXT}\n".format(
                  N=len(data_nts), TXT=fout_txt))
docs: write text table of depth-01 GO terms and their letter representation.