「pygame.error：視頻系統未初始化」在調用「pygame.event.get（）」後

Question

當我嘗試加載我的遊戲時，除了事件崩潰和python沒有響應之外，所有的工作都正常。我看不到我錯過了什麼。

這裏是整個代碼：

# To change this license header, choose License Headers in Project Properties. 
# To change this template file, choose Tools | Templates 
# and open the template in the editor. 

import pygame 
import random 
from os import path 

img_dir = path.join(path.dirname(__file__), 'Sprites') 
snd_dir = path.join(path.dirname(__file__), 'sound') 

WIDTH = 480 
HEIGHT = 600 
FPS = 60 

car_img = pygame.image.load(path.join(img_dir, "copgreen20.bmp")) 
mob_img = pygame.image.load(path.join(img_dir, "mob_zom.bmp")) 
priv_img = pygame.image.load(path.join(img_dir, "copgreen20.bmp")) 
# define colors 
WHITE = (255, 255, 255) 
BLACK = (0, 0, 0) 
RED = (255, 0, 0) 
GREEN = (0, 255, 0) 
BLUE = (0, 0, 255) 
YELLOW = (255, 255, 0) 

# initialize pygame and create window 
pygame.init() 
pygame.display.init() 
screen = pygame.display.set_mode([800, 600]) 
test = "space.ogg" 

pygame.mixer.init(frequency=22050, size=-16, channels=2, buffer=4096) 
pygame.mixer.music.load(path.join(snd_dir, 'atari.ogg')) 
pygame.mixer.music.play(-1)  
screen = pygame.display.set_mode((WIDTH, HEIGHT)) 
pygame.display.set_caption("My Game") 
clock = pygame.time.Clock() 
clock.tick(FPS) 
font_name = pygame.font.match_font('Arial') 
def draw_text(surf, text, size, x, y): 
    font = pygame.font.Font(font_name, size) 
    text_surface = font.render(text, True, BLUE) 
    text_rect = text_surface.get_rect() 
    text_rect.midtop = (y, x) 
    surf.blit(text_surface, text_rect) 

font_name = pygame.font.match_font('Arial') 
def draw_text(surf, text, size, x, y): 
    font = pygame.font.Font(font_name, size) 
    text_surface = font.render(text, True, YELLOW) 
    text_rect = text_surface.get_rect() 
    text_rect.midtop = (x, y) 
    surf.blit(text_surface, text_rect) 
class Player(pygame.sprite.Sprite): 
    def __init__(self): 
     pygame.sprite.Sprite.__init__(self) 
     self.image = pygame.Surface((80, 50)) 
     self.images = [] 
     self.image = car_img 
     self.rect = self.image.get_rect() 
     self.rect.centerx = WIDTH/2 
     self.rect.bottom = HEIGHT - 50 
     self.speedx = 0 
     self.image = pygame.transform.scale(car_img, (50, 80)) 
     self.image.set_colorkey(GREEN) 
    def update(self): 
     self.speedx = 0 
     keystate = pygame.key.get_pressed() 
     if keystate[pygame.K_LEFT]: 
      self.speedx = -8 
     if keystate[pygame.K_RIGHT]: 
      self.speedx = 8 
     if keystate[pygame.K_UP]: 
      self.speedy = -8 
     self.rect.x += self.speedx 
     if self.rect.right > WIDTH: 
      self.rect.right = WIDTH 
     if self.rect.left < 0: 
      self.rect.left = 0 

    def shoot(self): 
     bullet = Bullet(self.rect.centerx, self.rect.top) 
     all_sprites.add(bullet) 
     bullets.add(bullet) 

class Mob(pygame.sprite.Sprite): 
    def __init__(self): 
     pygame.sprite.Sprite.__init__(self) 
     self.image = pygame.Surface((30, 40)) 
     self.image = mob_img 
     self.rect = self.image.get_rect() 
     self.rect.x = random.randrange(WIDTH - self.rect.width) 
     self.rect.y = random.randrange(-100, -40) 
     self.speedy = random.randrange(1, 9) 
     self.speedx = random.randrange(-3, 3) 
     self.image.set_colorkey(WHITE) 
     self.image.set_colorkey(YELLOW) 
    def update(self): 
     self.rect.x += self.speedx 
     self.rect.y += self.speedy 
     if self.rect.top > HEIGHT + 10 or self.rect.left < -25 or self.rect.right > WIDTH + 20: 
      self.rect.x = random.randrange(WIDTH - self.rect.width) 
      self.rect.y = random.randrange( -100, -40) 
      self.speedy = random.randrange(1, 8) 

class Priv(pygame.sprite.Sprite): 
    def __init__(self): 
     pygame.sprite.Sprite.__init__(self) 
     self.image = pygame.Surface((30, 40)) 
     self.image = priv_img 
     self.rect = self.image.get_rect() 
     self.rect.x = random.randrange(WIDTH - self.rect.width) 
     self.rect.y = random.randrange(-100, -40) 
     self.speedy = random.randrange(1, 9) 
     self.speedx = random.randrange(-3, 3) 
     self.image.set_colorkey(WHITE) 
     self.image.set_colorkey(YELLOW) 
    def update(self): 
     self.rect.x += self.speedx 
     self.rect.y += self.speedy 
     if self.rect.top > HEIGHT + 10 or self.rect.left < -25 or self.rect.right > WIDTH + 20: 
      self.rect.x = random.randrange(WIDTH - self.rect.width) 
      self.rect.y = random.randrange( -100, -40) 
      self.speedy = random.randrange(1, 8) 

class Bullet(pygame.sprite.Sprite): 
    def __init__(self, x, y): 
     pygame.sprite.Sprite.__init__(self) 
     self.image = pygame.Surface((10, 20)) 
     self.image.fill(YELLOW) 
     self.rect = self.image.get_rect() 
     self.rect.bottom = y 
     self.rect.centerx = x 
     self.speedy = 200 

def show_go_screen(): 
    screen.blit(background, background_rect) 
    draw_text(screen, "SHMUP!", 64, WIDTH/2, HEIGHT/4) 
    draw_text(screen, "Arrow keys move, Space to fire", 22, 
       WIDTH/2, HEIGHT/2) 
    draw_text(screen, "Press a key to begin", 18, WIDTH/2, HEIGHT * 3/4) 
    pygame.display.flip() 
    waiting = True 
    while waiting: 
     clock.tick(FPS) 
     for event in pygame.event.get(): 
      if event.type == pygame.QUIT: 
       pygame.quit() 
      if event.type == pygame.K_SPACE: 
       waiting = False 

all_sprites = pygame.sprite.Group() 
mobs = pygame.sprite.Group() 
player = Player() 
all_sprites.add(player) 

background = pygame.image.load(path.join(img_dir, "back_road_update.bmp")).convert() 
background_rect = background.get_rect() 
bullets = pygame.sprite.Group() 
allspriteslist = pygame.sprite.Group() 

#showstartscreen() 

for i in range(8): 
    m = Mob() 
    all_sprites.add(m) 
    mobs.add(m) 

#def game_intro(): 
    #display = pygame.display.set_mode((800,600)) 
    #intro = True 
    #while intro: 
     #for event in pygame.event.get(): 
      #if event.type == pygame.QUIT: 
       #pygame.quit() 
       #quit() 

     #display.fill(BLACK) 
     #largeText = pygame.font.match_font('Arial',10) 
     #textSurf, textRect = draw_text(text, size, x, y) 
     #textRect.centre = ((display_width/2), (display_height/2)) 
     #display.blit(textSurf, textRect) 
     #pygame.display.update() 
     #clock.tick(15) 
    #pygame.display.update() 
show_go_screen() 
score = 000 
score2 = 50 
# Game loop 
#game_intro() 
game_over = True 
running = True 
while running: 
    if game_over: 
     game_over = False 
running = True 
while running: 
    # keep loop running at the right speed 
    clock.tick(FPS) 
    # Process input (events) 
    for event in pygame.event.get(): 
     # check for closing window 
     if event.type == pygame.QUIT: 
      running = False 
      #for i in range(5): 
        #m = Mob() 
        #all_sprites.add(m) 
        #mobs.add(m) 
     elif event.type == pygame.KEYDOWN: 
      if score2 == 0: 
       game_over = True 
      if event.type == pygame.K_9: 
       running = False 
      if event.key == pygame.K_SPACE: 
       player.shoot() 
       score2 -= 1 
      if event.key == pygame.K_EQUALS: 
       for i in range(100): 
        m = Mob() 
        all_sprites.add(m) 
        mobs.add(m) 
      #if event.key == pygame.K_SPACE: 
      if clock.tick == 10: 
       for i in range(100): 
        m = Mob() 
        all_sprites.add(m) 
        mobs.add(m) 
      if event.key == pygame.K_1: 
       for i in range(2): 
        p = Priv() 
        all_sprites.add(p) 
        Priv.add(p) 
      if event.key == pygame.K_2: 
       for i in range(10): 
        m = Mob() 
        all_sprites.add(m) 
        mobs.add(m) 
    # Update 
    all_sprites.update() 

    hits = pygame.sprite.groupcollide(mobs, bullets, True, True) 
    for hit in hits: 
      score += 1 
      m = Mob() 
      all_sprites.add(m) 
      mobs.add(m) 
      p = Priv() 
      all_sprites.add(m) 
      Priv.add(p) 

    hits = pygame.sprite.spritecollide(player, mobs, False) 
    #if hits: 
     #running = False 

    try: 
     for i in bullets: 
      i.rect.bottom += -5 
    except: 
     None 
     # Draw/render 
    screen.fill(BLACK) 
    screen.blit(background, background_rect) 
    draw_text(screen, str(score), 50, WIDTH/10, 10) 
    draw_text(screen, str(score2), 50, HEIGHT/13, 200) 
    #draw_text(screen, str(scores), 50, WIDTH/10, 10) 
    all_sprites.draw(screen) 
# *after* drawing everything, flip the display 
    pygame.display.flip() 
pygame.QUIT 

這裏是發生這種情況，如果我強制退出應用程序錯誤：

Traceback (most recent call last): 

File "/Users/harrisonj11/NetBeansProjects/game_test_jakob/src/game_test_jakob.py", line 187, in <module> 
    show_go_screen() 

File "/Users/harrisonj11/NetBeansProjects/game_test_jakob/src/game_test_jakob.py", line 147, in show_go_screen 
    for event in pygame.event.get(): 
pygame.error: video system not initialized 

Answer 1

pygame.quit不會退出整個程序，它只是取消初始化pygame模塊。因此，show_go_screen中的while循環仍在運行，並調用pygame.event.get()，但在未初始化所有內容並引發pygame.error: video system not initialized後，該循環不再有效。

退出遊戲sys.exit()後pygame.quit()。在文件的頂部添加import sys。

此外，運行遊戲，我不得不修改事件循環中show_go_screen並刪除第一個while running:循環：

def show_go_screen(): 
    screen.blit(background, background_rect) 
    draw_text(screen, "SHMUP!", 64, WIDTH/2, HEIGHT/4) 
    draw_text(screen, "Arrow keys move, Space to fire", 22, 
       WIDTH/2, HEIGHT/2) 
    draw_text(screen, "Press a key to begin", 18, WIDTH/2, HEIGHT * 3/4) 
    pygame.display.flip() 
    waiting = True 
    while waiting: 
     clock.tick(FPS) 
     for event in pygame.event.get(): 
      if event.type == pygame.QUIT: 
       pygame.quit() 
       sys.exit() 
      # First check if the event type is KEYDOWN. 
      if event.type == pygame.KEYDOWN: 
       # Then you need to check if the `event.key` not `event.type` 
       # equals `pygame.K_SPACE`. 
       if event.key == pygame.K_SPACE: 
        waiting = False