code: def save(self, file_tag='2016', add_header='N'):
          
          fname = self.get_filename(file_tag)
          with open(fname, 'a') as f:
              if add_header == 'Y':
                  f.write(self.format_hdr())
                  
              for e in self.table: 
                      f.write(e.format_csv())
docs: save table to folder in appropriate files
          NOTE - ONLY APPEND AT THIS STAGE - THEN USE DATABASE