code: def _format_numeric_sequence(self, _sequence, separator="."):
          
          if not _sequence:
              return colorize(_sequence, "purple")
          _sequence = _sequence if _sequence is not None else self.obj
          minus = (2 if self._depth > 0 else 0)
          just_size = len(str(len(_sequence)))
          out = []
          add_out = out.append
          for i, item in enumerate(_sequence):
              self._incr_just_size(just_size+minus)
              add_out(self._numeric_prefix(
                  i, self.pretty(item, display=False),
                  just=just_size, color="blue", separator=separator))
              self._decr_just_size(just_size+minus)
          if not self._depth:
              return padd("\n".join(out) if out else str(out), padding="top")
          else:
              return "\n".join(out) if out else str(out)
docs: Length of the highest index in chars = justification size