Question

尝试使用pygame制作我的第一个python游戏。看来我让角色移动的方式可以防止游戏结束后循环播放。我真的是python和编程的新手，没有其他线程帮助我。

试图修改碰撞的结果，但只会产生更多的错误。这是错误消息：

if pressed[pygame.K_s] and y+51 < display_height: y += 15
UnboundLocalError: local variable 'pressed' referenced before assignment

 import pygame
    import random
    import time
    import os

    os.chdir('/Users/william_rosa/desktop/school/python')

    pygame.init()


    display_width = 800
    display_height = 600


    black = (0,0,0)
    white = (255,255,255)
    red = (255,0,0)
    green = (0,255,0)
    blue = (0,0,255)

    cwd = os.getcwd()
    print(cwd)


    gamedisplay = pygame.display.set_mode((display_width,display_height))
    pygame.display.set_caption('MonkeyJump')
    clock = pygame.time.Clock()


    monkeyimg = pygame.image.load('still_monkey2.png')
    background = pygame.image.load('jungle2.png')
    missileimg = pygame.image.load('missile.png')


    def missile(mx,my):
        gamedisplay.blit(missileimg,(mx,my))


    def monkey(x,y):
        gamedisplay.blit(monkeyimg,(x,y))

    def text_objects(text, font, color):
        textsurface = font.render(text, True, red)
        return textsurface, textsurface.get_rect()

    def message_display(text):
        largetext = pygame.font.Font('freesansbold.ttf',75)
        textsurf, textrect = text_objects(text, largetext, red)
        textrect.center = ((display_width/2),(display_height/2))
        gamedisplay.blit(textsurf, textrect)
        pygame.display.update()
        time.sleep(5)

    def dead():
        message_display('The Monkey Is Dead')

    def game_loop():
        x = (display_width * 0.1)
        y = (display_height * 0.45)
        mx_start = display_width+200
        my_start = random.randrange(0,display_height)
        m_speed = -20
        rect_monkey = monkeyimg.get_rect()
        rect_missile = missileimg.get_rect()


        gameExit = False

        while not gameExit:

            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    gameExit = True

                pressed = pygame.key.get_pressed()
            if pressed[pygame.K_s] and y+51<display_height: y += 15
            if pressed[pygame.K_z] and y>9: y += -15


            gamedisplay.blit(background,(0,0))
            missile(mx_start,my_start)
            mx_start += m_speed
            monkey(x,y)

            if mx_start+135 < 0:
                mx_start = display_width
                my_start = random.randrange(0,display_height)

            if y in range(my_start-50,my_start+10):
                if x in range(mx_start-40,mx_start+120):
                    dead()
                    game_loop()







            pygame.init()
            pygame.display.update()
            clock.tick(60)



    game_loop()
    pygame.quit()

Answer 1

如果for循环从不执行，则您永远不会设置pressed。我认为这些if语句必须位于循环内部。

            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    gameExit = True

                pressed = pygame.key.get_pressed()
                if pressed[pygame.K_s] and y+51<display_height: y += 15
                if pressed[pygame.K_z] and y>9: y += -15

Answer 2

正如巴尔玛所说，pressed = pygame.key.get_pressed()行必须缩进。

UnboundLocalError：赋值之前引用了本地变量“按下”

2 个答案: