code: def _file_name(self, dtype_out_time, extension='nc'):
          
          if dtype_out_time is None:
              dtype_out_time = ''
          out_lbl = utils.io.data_out_label(self.intvl_out, dtype_out_time,
                                            dtype_vert=self.dtype_out_vert)
          in_lbl = utils.io.data_in_label(self.intvl_in, self.dtype_in_time,
                                          self.dtype_in_vert)
          start_year = utils.times.infer_year(self.start_date)
          end_year = utils.times.infer_year(self.end_date)
          yr_lbl = utils.io.yr_label((start_year, end_year))
          return '.'.join(
              [self.name, out_lbl, in_lbl, self.model.name,
               self.run.name, yr_lbl, extension]
          ).replace('..', '.')
docs: Create the name of the aospy file.