1

我有大学的这个任务。我现在已经将我的代码更改了 3 次以上，甚至将其调整为可以正常工作的代码。我们有两种模式：一种是幽灵从吃豆人身上反弹，另一种是吃豆人从它们身上反弹。我知道我可以使用列表来缩短此代码，但我仍在学习如何使它们正常工作。

我每次都会遇到这个错误，我真的不知道为什么任何建议都会很棒。

Traceback (most recent call last):
  File "C:/", line 111, in <module>
    mode_switch()
  File "C:/", line 21, in mode_switch
    blue_right, orange_right, pink_right,\
UnboundLocalError: local variable 'blue_right' referenced before assignment

我的代码

import pygame


import pygame
from random import *



pygame.init()

def ghost_collision():

    SCREAM.play()
    pacman_velocity[0] = randint(-1,1)
    pacman_velocity[1] = randint(-1,1)
    if pacman_velocity[0] < 0:
        pacman = pygame.image.load(PACMAN_LEFT).convert()
    elif pacman_velocity[0] > 0:
        pacman = pygame.image.load(PACMAN_RIGHT).convert()
    return pacman_velocity

def mode_switch():
    global mode
    blue_right, orange_right, pink_right,\
          red_right, blue, orange, pink, red
    if mode == False:
        mode = True
        blue = pygame.image.load(GHOST_SCARED).convert()
        orange = pygame.image.load(GHOST_SCARED).convert()
        pink = pygame.image.load(GHOST_SCARED).convert()
        red = pygame.image.load(GHOST_SCARED).convert()
    else:
        mode = False
        if blue_right == True:
            blue = pygame.image.load(BLUE_LEFT).convert()
            blue_right = False
        else:
            blue = pygame.image.load(BLUE_RIGHT).convert()
            blue_right = True
    if orange_right == True:
        orange = pygame.image.load(ORANGE_LEFT).convert()
        orange_right = False
    else:
        orange = pygame.image.load(ORANGE_RIGHT).convert()
        orange_right = True
    if pink_right == True:
        pink = pygame.image.load(PINK_LEFT).convert()
        pink_right = False
    else:
        pink = pygame.image.load(PINK_RIGHT).convert()
        pink_right = True
    if red_right == True:
        red = pygame.image.load(RED_LEFT).convert()
        red_right = False
    else:
        red = pygame.image.load(RED_RIGHT).convert()
        red_right = True


PACMAN_LEFT = 'pacman-left.png'
PACMAN_RIGHT = 'pacman-right.png'
BLUE_LEFT = 'blue-left.png'
BLUE_RIGHT = 'blue-right.png'
ORANGE_LEFT = 'orange-left.png'
ORANGE_RIGHT = 'orange-right.png'
PINK_LEFT = 'pink-left.png'
PINK_RIGHT = 'pink-right.png'
RED_LEFT = 'red-left.png'
RED_RIGHT = 'red-right.png'
GHOST_SCARED = 'vulnerable.png'
BOUNCE_SOUND = 'Thump.wav'
SOUND = pygame.mixer.Sound(BOUNCE_SOUND)
WIDTH = 800
HEIGHT = 600
BACKGROUND_COLOUR = 0, 0, 0
CAPTION = 'Random Pacman'
pacman_up = True#define image direction controlling variables
pacman_right = True
blue_right = False
orange_right = True
pink_right = False
red_right = True
mode = False

frame = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption(CAPTION)
pacman = pygame.image.load(PACMAN_RIGHT).convert()#create sprites and define boundaries
pacman_boundary = pacman.get_rect(center = (300,300))
pacman_velocity = [1, 1]
blue = pygame.image.load(BLUE_LEFT).convert()
blue_boundary = pacman.get_rect(center = (300,300))
blue_velocity = [-1, -1]
orange = pygame.image.load(ORANGE_RIGHT).convert()
orange_boundary = pacman.get_rect(center = (300,300))
orange_velocity = [1, -1]
pink = pygame.image.load(PINK_LEFT).convert()
pink_boundary = pacman.get_rect(center = (300,300))
pink_velocity = [-1, 1]
red = pygame.image.load(RED_RIGHT).convert()
red_boundary = pacman.get_rect(center = (300,300))
red_velocity = [1, 1]

finished = False
while not finished:
    pygame.event.pump()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            finished = True
        if event.type == pygame.MOUSEBUTTONUP:
            mode_switch()

    #####################################################

if pacman_boundary.left < 0 or pacman_boundary.right > WIDTH:
    SOUND.play()
    pacman_velocity[0] = -1 * pacman_velocity[0]
    if pacman_velocity[0] < 0:
        pacman = pygame.image.load(PACMAN_LEFT).convert()
    elif pacman_velocity[0] > 0:
        pacman = pygame.image.load(PACMAN_RIGHT).convert()
    pacman_velocity[1] = randint(-1,1)

if pacman_boundary.top < 0 or pacman_boundary.bottom > HEIGHT:
    SOUND.play()
    pacman_velocity[1] = -1 * pacman_velocity[1]

if mode == False:        
    if pacman_boundary.colliderect(blue_boundary)\
       or pacman_boundary.colliderect(orange_boundary)\
       or pacman_boundary.colliderect(pink_boundary)\
       or pacman_boundary.colliderect(red_boundary):
        ghost_collision()

    #####################################################

if blue_boundary.left < 0 or blue_boundary.right > WIDTH:
    blue_velocity[0] = -1 * blue_velocity[0]
    if mode == False:
        if blue_right == True:
            blue = pygame.image.load(BLUE_LEFT).convert()
            blue_right = False
        else:
            blue = pygame.image.load(BLUE_RIGHT).convert()
            blue_right = True

if blue_boundary.top < 0 or blue_boundary.bottom > HEIGHT:
    SOUND.play()
    blue_velocity[1] = -1 * blue_velocity[1]

if mode == True:
    if pacman_boundary.colliderect(blue_boundary):

        blue_velocity[0] = randint(-1,1)
        blue_velocity[1] = randint(-1,1)



#####################################################

if orange_boundary.left < 0 or orange_boundary.right > WIDTH:
    orange_velocity[0] = -1 * orange_velocity[0]
    if mode == False:
        if orange_right == True:
            orange = pygame.image.load(ORANGE_LEFT).convert()
            orange_right = False
        else:
            orange = pygame.image.load(ORANGE_RIGHT).convert()
            orange_right = True

if orange_boundary.top < 0 or orange_boundary.bottom > HEIGHT:
    SOUND.play()
    orange_velocity[1] = -1 * orange_velocity[1]

if mode == True:
    if pacman_boundary.colliderect(orange_boundary):
        orange_velocity[0] = randint(-1,1)
        orange_velocity[1] = randint(-1,1)


#####################################################

if pink_boundary.left < 0 or pink_boundary.right > WIDTH:#
    pink_velocity[0] = -1 * pink_velocity[0]
    if mode == False:
        if pink_right == True:
            pink = pygame.image.load(PINK_LEFT).convert()
            pink_right = False
        else:
            pink = pygame.image.load(PINK_RIGHT).convert()
            pink_right = True

if pink_boundary.top < 0 or pink_boundary.bottom > HEIGHT:
    SOUND.play()
    pink_velocity[1] = -1 * pink_velocity[1]

if mode == True:
    if pacman_boundary.colliderect(pink_boundary):
        pink_velocity[0] = randint(-1,1)
        pink_velocity[1] = randint(-1,1)


#####################################################

if red_boundary.left < 0 or red_boundary.right > WIDTH:
    red_velocity[0] = -1 * red_velocity[0]
    if mode == False:
        if red_right == True:
            red = pygame.image.load(RED_LEFT).convert()
            red_right = False
        else:
            red = pygame.image.load(RED_RIGHT).convert()
            red_right = True

if red_boundary.top < 0 or red_boundary.bottom > HEIGHT:
    SOUND.play()
    red_velocity[1] = -1 * red_velocity[1]

if mode == True:
    if pacman_boundary.colliderect(red_boundary):
        red_velocity[0] = randint(-1,1)
        red_velocity[1] = randint(-1,1)


#####################################################



pacman_boundary = pacman_boundary.move(pacman_velocity)
blue_boundary = blue_boundary.move(blue_velocity)
orange_boundary = orange_boundary.move(orange_velocity)
pink_boundary = pink_boundary.move(pink_velocity)
red_boundary = red_boundary.move(red_velocity)

frame.fill(BACKGROUND_COLOUR)
frame.blit(pacman, pacman_boundary)
frame.blit(blue, blue_boundary)
frame.blit(orange, orange_boundary)
frame.blit(pink, pink_boundary)
frame.blit(red, red_boundary)
pygame.display.flip()

pygame.quit()
4

2 回答 2

3

认为问题出在以下几行：

def mode_switch():
    global mode
    blue_right, orange_right, pink_right,\
          red_right, blue, orange, pink, red

您将 mode 定义为全局变量，而不是在您的程序中看起来是全局变量的其余变量，例如，您需要将它们更新为全局变量 - 因为您在 mode_switch 函数中修改它们

于 2013-04-15T04:39:20.583 回答
1 
blue_right, orange_right, pink_right,\
          red_right, blue, orange, pink, red

这条线明显断了。至少前一行的“全局”声明在这里没有效果。可能您在 global 语句的行中缺少尾随 '\'，或者相应的行需要它自己的 global 语句。

于 2013-04-15T04:40:18.597 回答