code: def add_f2str(self, dcts, srcfld, dstfld, dstfmt):
          
          # Example: f2str = objntmgr.add_f2str(dcts, "p_fdr_bh", "s_fdr_bh", "{:8.2e}")
          # ntobj = self.get_ntobj()
          # print(ntobj)
          assert len(dcts) == len(self.nts)
          for dct, ntgoea in zip(dcts, self.nts):
              valorig = getattr(ntgoea, srcfld)
              valstr = dstfmt.format(valorig)
              dct[dstfld] = valstr
docs: Add a namedtuple field of type string generated from an existing namedtuple field.