Python | Pygame |未检测到全局变量更改

Question

在我测试的这部分代码中：

       if y <= o_y + 160:

        if x >= o_x and x <= o_x + 80 or x + 60 > o_x and x + 60 < o_x + 80:

这基本上测试了两个不同对象（基于玩家的对象[x]和下降对象[o_x（1,2）]）之间的碰撞，如果它检测到碰撞，它将显示＆＃39;游戏结束＆＃ 39;图片并将播放器带回主菜单，它还将所有对象y轴设置为0.尽管如此，当你点击GO（播放）时，它会返回到相同的情况并忽略我应该重置情况的代码（移动将对象放回屏幕顶部[global y_o, o_y = 0]）

我是python的新手，所以非常感谢解释

def fallingObject():
global car
car = a
global car1
car1 = c
global car2
car2 = e

objectSpawn = True
while objectSpawn:
    if o_y < height:
        global o_y
        o_y += +1
        global o_y1
        o_y1 += +1
        global o_y2
        o_y2 += +1
        objectSpawn = False
        blit_screen()
    if o_y >= height:
        global o_x1
        o_x1 = random.randrange(220, 450)
        global o_y1
        o_y1 = 0
        global o_x2
        o_x2 = random.randrange(450, 680)
        global o_y2
        o_y2 = 0
        global o_x
        o_x = random.randrange(-10, 220)                                   
        global o_y
        o_y = 0
        global car_s
        car_s = random.randrange(1,6)
        global car_s1
        car_s1 = random.randrange(1,6)
        global car_s2
        car_s2 = random.randrange(1,6)
        objectSpawn = False
        blit_screen()

    if y + 120 < o_y:
        print("y cross over")

    if y <= o_y + 160:

        if x >= o_x and x <= o_x + 80 or x + 60 > o_x and x + 60 < o_x + 80:
            screen.blit(crash, (0,0))
            pygame.display.flip()
            pygame.time.delay(3000)
            game_intro()
            global o_y
            o_y = 0
            global o_y1
            o_y1 = 0
            global o_y2
            o_y2 = 0
            blit_screen()

    if y + 120 < o_y1:
        print("y cross over")

    if y <= o_y1 + 160:

        if x >= o_x1 and x <= o_x1 + 80 or x + 60 > o_x1 and x + 60 < o_x1 + 80:
            screen.blit(crash, (0,0))
            pygame.display.flip()
            pygame.time.delay(3000)
            game_intro()
            global o_y
            o_y = 0
            global o_y1
            o_y1 = 0
            global o_y2
            o_y2 = 0
            blit_screen()


    if y + 120 < o_y2:
        print("y cross over")

    if y <= o_y2 + 160:

        if x >= o_x2 and x <= o_x2 + 80 or x + 60 > o_x2 and x + 60 < o_x2 + 80:
            screen.blit(crash, (0,0))
            pygame.display.flip()
            pygame.time.delay(3000)
            game_intro()
            global o_y
            o_y = 0
            global o_y1
            o_y1 = 0
            global o_y2
            o_y2 = 0
            blit_screen()


def blit_screen():

    if car_s == 1:
        car = a
    else:
        if car_s == 2:
            car = b
        else:
            if car_s == 3:
                car = c
            else:
                if car_s == 4:
                    car = d
                else:
                    if car_s == 5:
                        car = e
                    else:
                        print(" ")

    if car_s1 == 1:
        car1 = a
    else:
        if car_s1 == 2:
            car1 = b
        else:
            if car_s1 == 3:
                car1 = c
            else:
                if car_s1 == 4:
                    car1 = d
                else:
                    if car_s1 == 5:
                        car1 = e
                    else:
                        print(" ")

    if car_s2 == 1:
        car2 = a
    else:
        if car_s2 == 2:
            car2 = b
        else:
            if car_s2 == 3:
                car2 = c
            else:
                if car_s2 == 4:
                    car2 = d
                else:
                    if car_s2 == 5:
                        car2 = e
                    else:
                        print(" ")

    screen.fill(blue)
    screen.blit(road, (0,0))
    screen.blit(car, (o_x,o_y))
    screen.blit(car1, (o_x1,o_y1))
    screen.blit(car2, (o_x2,o_y2))
    screen.blit(carImg, (x,y))
    pygame.display.flip()

clock.tick(60)
game_intro()