Nav (Version 1)

from retro.game import Game

HEIGHT = 25
WIDTH = 25

class Spaceship:
    name = "ship"
    character = '^'
    position = (WIDTH // 2, HEIGHT - 1)

    def handle_keystroke(self, keystroke, game):
        x, y = self.position
        if keystroke.name in ("KEY_LEFT", "KEY_RIGHT"):
            if keystroke.name == "KEY_LEFT":
                new_position = (x - 1, y)
            else:
                new_position = (x + 1, y)
            if game.on_board(new_position):
                if game.is_empty(new_position):
                    self.position = new_position
                else:
                    game.end()

class Asteroid:
    character = 'O'

    def __init__(self, position):
        self.position = position

    def play_turn(self, game):
        if game.turn_number % 2 == 0:
            x, y = self.position
            if y == HEIGHT - 1:
                game.remove_agent_by_name(self.name)
            else:
                ship = game.get_agent_by_name('ship')
                new_position = (x, y + 1)
                if new_position == ship.position:
                    game.end()
                else:
                    self.position = new_position

ship = Spaceship()
asteroid = Asteroid("asteroid", (WIDTH // 2, 0))
game = Game(
    [ship, asteroid],
    {"score": 0},
    board_size=(WIDTH, HEIGHT)
)
game.play()