code: def _set_winning_team(self):
          
          if not self._summary['finished']:
              return
          for team in self._summary['diplomacy']['teams']:
              team['winner'] = False
              for player_number in team['player_numbers']:
                  for player in self._summary['players']:
                      if player_number == player['number']:
                          if player['winner']:
                              team['winner'] = True
docs: Mark the winning team.