我正在尝试仅使用随机和数学模块制作吃豆人游戏

问：

当吃豆子撞到墙上时，我遇到了麻烦。 我输入了一个迷宫，并使用 for 循环绘制了迷宫，pacman 运动也一切正常，但是当它撞到墙上时，我希望它停止。

我怎样才能让它停止，然后等待用户输入使用键切换方向？ 我尝试使用一个变量说它停止了，它会停止，但它不会响应我输入的任何键，让它再次移动

maze = [
"XXXXXXXXXXXXXXXXXXXXXXXXX",
"XP  XXXXXXXE           XX",
"X  XXXXXXX  XXXXXX  XXXXX",
"X       XX  XXXXXX  XXXXX",
"X       XX  XXX       EXX",
"XXXXXX  XX  XXX        XX",
"XXXXXX  XX  XXXXXX  XXXXX",
"XXXXXX  XX    XXXX  XXXXX",
"X  XXX        XXXX  XXXXX",
"X  XXX  XXXXXXXXXXXXXXXXX",
"X         XXXXXXXXXXXXXXX",
"X                XXXXXXXX",
"XXXXXXXXXXXX     XXXXX  X",
"XXXXXXXXXXXXXXX  XXXXX  X",
"XXX  XXXXXXXXXX         X",
"XXXE                    X",
"XXX         XXXXXXXXXXXXX",
"XXXXXXXXXX  XXXXXXXXXXXXX",
"XXXXXXXXXX              X",
"XX   XXXXX              X",
"XX   XXXXXXXXXXXXX  XXXXX",
"XX    YXXXXXXXXXXX  XXXXX",
"XX          XXXX        X",
"XXXXE                   X",
"XXXXXXXXXXXXXXXXXXXXXXXXX"
]

def move():

    if player.direction=="right":
        player.setx(player.xcor()+7)
    if player.direction=="left":
        player.setx(player.xcor()-7)
    if player.direction=="up":
        player.sety(player.ycor()+7)
    if player.direction=="down":
        player.sety(player.ycor()-7)
def right():
    player.direction="right"


def left():
    player.direction="left"


def up():
    player.direction="up"
    

def down():
    player.direction="down" 
 

def exit():
    turtle.bye()

screen=turtle.Screen()
screen.bgcolor("black")
screen.setup(900,900)
screen.tracer(n=0)
walllist=[]
x=-365
y=360

for r in maze:
    for h in r:
        if h=="X":
            wall=turtle.Turtle()
            wall.color("blue")
            wall.shapesize(1.43,1.43,1)
            wall.shape("square")
            wall.penup()
            wall.goto(x,y)
            walllist.append(wall)
        if h=="P":
            player=turtle.Turtle()
            player.speed(0)
            player.color("yellow")
            player.shape("circle")
            player.penup()
            player.direction="stop"
            player.goto(x,y)
        x+=30
    x=-365
    y-=30


screen.listen()
screen.onkey(right,"Right")
screen.onkey(up,"Up")
screen.onkey(down,"Down")
screen.onkey(left,"Left")
screen.onkey(exit,"Escape")

while True:
        move()
        screen.update()
        for wall in walllist:
            if player.distance(wall)<29:
              player.direction="stop"