按下另一个按钮或使用鼠标时角色无法移动，子弹也不会发射

Question

因此，我已经开始为敌人和玩家工作，但是当我按下左右的按钮（例如要射击的空间）时，玩家无法移动，子弹本身实际上不会出来或完全出现。它在pygame和ima中说实话，我不知道有什么问题

import pygame
import random

pygame.init()

screen = pygame.display.set_mode((800, 600))

background = pygame.image.load("BackgroundImg.jpg")

pygame.display.set_caption("Real Hero")
icon = pygame.image.load('Icon.png')
pygame.display.set_icon(icon)

playerImg = pygame.image.load('Player.png')
playerX = 370
playerY = 480
playerX_change = 0

enemyImg = pygame.image.load('Enemy.png')
enemyX = random.randint(0, 800)
enemyY = random.randint(50, 150)
enemyX_change = 0.1
enemyY_change = 40

bulletImg = pygame.image.load('Bullet.png')
bulletX = 0
bulletY = 480
bulletX_change = 0
bulletY_change = 10
bullet_state = "ready"


def player(x, y):
    screen.blit(playerImg, (x, y))


def enemy(x, y):
    screen.blit(enemyImg, (x, y))


def fire_bullet(x, y):
    global bullet_state
    bullet_state = "fire"
    screen.blit(bulletImg, (x + 16, y + 10))


running = True
while running:

    screen.fill((0, 0, 0))
    screen.blit(background, (0, 0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    if event.type == pygame.KEYDOWN:
        if event.key == pygame.K_LEFT:
            playerX_change = -0.3
        if event.key == pygame.K_RIGHT:
            playerX_change = 0.3
        if event.key == pygame.K_SPACE:
            fire_bullet(playerX, bulletY)

        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                playerX_change = 0

        playerX += playerX_change
        if playerX <= 0:
            playerX = 0
        elif playerX >= 736:
            playerX = 736

    enemyX += enemyX_change
    if enemyX <= 0:
        enemyX_change = 0.1
        enemyY += enemyY_change
    elif enemyX >= 736:
        enemyX_change = -0.1
        enemyY += enemyY_change

    if bullet_state is "fire":
        fire_bullet(playerX, bulletY)
        bulletY -= bulletY_change

    enemy(enemyX, enemyY)
    player(playerX, playerY)
    pygame.display.update()

Answer 1

这是凹痕：

running = True
while running:

    screen.fill((0, 0, 0))
    screen.blit(background, (0, 0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    # INDENTATION
    #-->|
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                playerX_change = -0.3
            if event.key == pygame.K_RIGHT:
                playerX_change = 0.3
            if event.key == pygame.K_SPACE:
                fire_bullet(playerX, bulletY)

            if event.type == pygame.KEYUP:
                if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                    playerX_change = 0
 
    # INDENTATION
    #<--|
    playerX += playerX_change
    if playerX <= 0:
        playerX = 0
    elif playerX >= 736:
        playerX = 736

    enemyX += enemyX_change
    if enemyX <= 0:
        enemyX_change = 0.1
        enemyY += enemyY_change
    elif enemyX >= 736:
        enemyX_change = -0.1
        enemyY += enemyY_change

    if bullet_state is "fire":
        fire_bullet(playerX, bulletY)
        bulletY -= bulletY_change

    enemy(enemyX, enemyY)
    player(playerX, playerY)
    pygame.display.update()