def get_hockeyist_by_id(self, hockeyist_id) -> Hockeyist: return first(self.world.hockeyists, lambda h: h.id == hockeyist_id)
def opponent(self) -> Player: return first(self.world.players, lambda p: not p.me)
def player(self) -> Player: return first(self.world.players, lambda p: p.me)