python 3.9中的队列模块有问题（蛇游戏）

Question

import pygame
import random
import queue

pygame.init()

#color values
black = (0, 0, 0)
white = (255, 255, 255)
red = (213, 50, 80)
green = (0, 255, 0)
blue = (50, 153, 213)
yellow = (255, 255, 0)

#resolution
diswidth = 600
disheight = 400

#window size and name
dis = pygame.display.set_mode((diswidth,disheight))
pygame.display.set_caption("Snake")

#snake variables
snakeblock = 10
snakespeed = 15

clock = pygame.time.Clock()

Q = queue.Queue(maxsize=10)

#fonts
font_style = pygame.font.SysFont("bahnschrift", 25)
score_font = pygame.font.SysFont("comicsansms", 35)

#score function
def yourscore(score):
    value = score_font.render(f"Score: {score}", True, yellow)
    dis.blit(value, [0, 0])

#function to add tail segments
def oursnake(snakeblock,snakelist):
    for x in snakelist:
        pygame.draw.rect(dis, black, [x[0], x[1], snakeblock, snakeblock])

#message function
def message(msg, color):
    mesg = font_style.render(msg, True, color)
    dis.blit(mesg, [diswidth/10, disheight/1.2])

#lots of things
def gameLoop():
    game_over = False
    game_close = False

    direction = (" ")

    x1 = diswidth / 2
    y1 = disheight / 2

    x1_change = 0
    y1_change = 0

    snakelist = []
    snakelenght = 1

    foodx = round(random.randrange(0, diswidth - snakeblock) / 10.0) * 10.0
    foody = round(random.randrange(0, disheight - snakeblock) / 10.0) * 10.0

#the main while loop
    while not game_over:
        #this is what happens if the snake collides with itself or with the walls
        while game_close == True:
            dis.fill(blue)
            pygame.HWSURFACE
            message("You lost! Press Q to quit or C to play again", red)

            pygame.display.update()

            #button mapings for game over screen
            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_over = True
                        game_close = False
                    if event.key == pygame.K_c:
                        gameLoop()
        #keypresses
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over=True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT and direction != "right":
                    Q.put("left")
                elif event.key == pygame.K_RIGHT and direction != "left":
                    Q.put("right")
                elif event.key == pygame.K_UP and direction != "down":
                    Q.put("up")
                elif event.key == pygame.K_DOWN and direction != "up":
                    Q.put("down")
        if Q.empty() is False:
            if Q.get() == "left" and direction != "right":
                x1_change = -snakeblock
                y1_change = 0
                direction = "left"
            elif Q.get() == "right" and direction != "left":
                x1_change = snakeblock
                y1_change = 0
                direction = "right"
            elif Q.get() == "up" and direction != "down":
                x1_change = 0
                y1_change = -snakeblock
                direction = "up"
            elif Q.get() == "down" and direction != "up":
                x1_change = 0
                y1_change = -snakeblock
                direction = "down"
            pygame.display.update()
        if x1 >= diswidth or x1 < 0 or y1 >= disheight or y1 < 0:
            game_close = True

        #lots of things im too lazy to space out
        x1 += x1_change
        y1 += y1_change
        dis.fill(blue)
        pygame.draw.rect(dis, black, [x1,y1,snakeblock,snakeblock])
        pygame.draw.rect(dis, green, [foodx, foody, snakeblock, snakeblock])
        pygame.display.update()

        snakehead = []
        snakehead.append(x1)
        snakehead.append(y1)
        snakelist.append(snakehead)
        if len(snakelist) > snakelenght:
            del snakelist[0]
        for x in snakelist[:-1]:
            if x == snakehead:
                game_close = True

        oursnake(snakeblock, snakelist)
        yourscore(snakelenght - 1)
        pygame.display.update()

        #Eats food
        if x1 == foodx and y1 == foody:
            foodx = round(random.randrange(0, diswidth - snakeblock) / 10.0) * 10.0
            foody = round(random.randrange(0, disheight - snakeblock) / 10.0) * 10.0
            snakelenght += 1
        clock.tick(snakespeed)
    pygame.quit()
    quit()
gameLoop()

这是我的蛇游戏代码。 我在使用队列模块时遇到了问题，因为每当我尝试输入一些它不会输入的内容时，如果我去检查队列大小，它会在每次勾选时更新自己，如果它为空，但一旦有内容，它就会停止

我只能向左移动（其他方向不允许我移动），当我向左移动后按下某个按钮时，它就会停止，我必须终止程序

Idk如果我的代码是问题（可能），但如果是这样，为什么它让我向左移动，而不是任何其他方向。 任何帮助都将不胜感激 另外，如何使帧速率更平滑

Answer 1

我认为这是因为您正在使用第一个if Q.get() == "left"上的队列，所以elif Q.get() == "right"正在处理队列中的下一项，而该项通常是空的

在测试之前，将从队列中获取的项目放入局部变量中

next_command = Q.get()
if next_command == "left" and direction != "right":
    x1_change = -snakeblock
    y1_change = 0
    direction = "left"
elif next_command == "right" and direction != "left":
    x1_change = snakeblock
    y1_change = 0
    direction = "right"
elif next_command == "up" and direction != "down":
    ...