code: def _prepare_start(self, client, player_id, game_info, game_data):
          
          self._client: "Client" = client
          self._game_info: "GameInfo" = game_info
          self._game_data: GameData = game_data
  
          self.player_id: int = player_id
          self.race: Race = Race(self._game_info.player_races[self.player_id])
          self._units_previous_map: dict = dict()
          self.units: Units = Units([], game_data)
docs: Ran until game start to set game and player data.