在PyCharm上，我的左键和右键都没有反应。

Question

#enable pygame mode
import pygame
pygame.init()

#create screen
screen = pygame.display.set_mode((900,600))

#Title + Logo
pygame.display.set_caption("Space Invader")
icon = pygame.image.load("chicken.png")
pygame.display.set_icon(icon)

#Player icon
player_icon = pygame.image.load("spaceship.png")
playerX = 400
playerY = 500

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

#game loop
running = True
while running:

    # backround colour  RGB
    screen.fill((0, 0, 0))

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
            #If key pressed check wether its right or left
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    print("key left pressed")
                if event.key == pygame.K_RIGHT:
                    print("key right pressed")
            if event.type == pygame.KEYUP:
                if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                    print("key stroke has benn released")


    #Player change in coordinates
    playerX += 0
    playerY += 0

    player(playerX, playerY)
    pygame.display.update()

在这次隔离期间，我一直在学习pygame和使用python进行游戏编程。我是通过看youtube上的教程来学习的。请不要给我降级，我已经很努力的把我的问题做的更好了，上次是我的第一个问题，被降级了2次。谢谢你的时间。