PyGame 角色不向左移动

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如何解决PyGame 角色不向左移动？

我有以下问题：角色没有正确向左移动。我尝试调试并看到在 drawfrantz 函数中 moveleft 不是真的，但在 while 游戏循环中却是这样。我尝试了很多，比如设置全局等等，但似乎根本不起作用。我遵循了 yt 教程，这是链接 https://www.youtube.com/watch?v=9Kh9s9__ywo

import pygame
pygame.init()

display_wIDth = 1280
display_height = 720

x = 250
y = 250
veLocity = 10
moveRIGHT = false
moveleft = false
stepIndex = 0

screen = pygame.display.set_mode((display_wIDth,display_height))
pygame.display.set_caption("Frantz Reichts!")
clock = pygame.time.Clock()

frantz_stationary = pygame.image.load("assets/frantz/trash_Ting3.png")

frantz_going_left = [None]*10
for indexofpic in range(1,9):
    frantz_going_left[indexofpic-1] = pygame.image.load("assets/frantz/L" + str(indexofpiC) + ".png")
    indexofpic = (indexofpic + 1)

frantz_going_right = [None]*10
for picindex in range(1,9):
    frantz_going_right[picindex-1] = pygame.image.load("assets/frantz/R" + str(picindeX) + ".png")
    picindex = (picindex + 1)





# Images #
stage1full = pygame.image.load("assets/WholeStage.png")
karavane = pygame.image.load("assets/Karavane.png")

def DrawFrantz():
    global stepIndex
    if stepIndex >= 8:
        stepIndex = 0
    if moveleft == True:
        screen.blit(frantz_going_left[stepIndex],(x,y))
        stepIndex += 1
    elif moveRIGHT == True:
        screen.blit(frantz_going_right[stepIndex],y))
        stepIndex += 1
    else:
        screen.blit(frantz_stationary,y))

while(true): #Game Loop
    screen.fill((0,0))
    screen.blit(stage1full,(0,0))
    screen.blit(karavane,0))

    DrawFrantz()

    userinput = pygame.key.get_pressed()
    if userinput[pygame.K_a]:
        x -= veLocity
        moveleft = True
        moveRIGHT = false
        
    if userinput[pygame.K_d]:
        x += veLocity
        moveleft = false
        moveRIGHT = True
    else:
        moveleft = false
        moveRIGHT = false
        stepIndex = 0


    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()

    pygame.time.delay(100)
    pygame.display.update()
    clock.tick(60)

解决方法

userInput = pygame.key.get_pressed()
if userInput[pygame.K_a]:
    x -= velocity
    moveLeft = True
    moveRIGHT = false
    
elif userInput[pygame.K_d]: # <- here elif instead of if
    x += velocity
    moveLeft = false
    moveRIGHT = True
else:
    moveLeft = false
    moveRIGHT = false
    stepIndex = 0

userInput = pygame.key.get_pressed()
move_x = userInput[pygame.K_d] - userInput[pygame.K_a]

moveLeft = move_x < 0
moveRIGHT = move_x > 0
x += move_x * velocity
if move_x = 0:
    stepIndex = 0

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