问我的乌龟没有检测到输入，它可以直接越过边界

EN

  import turtle, os, math
    #setting up the dimensions of the screen + color

    wn = turtle.Screen()
    wn.screensize(500,500)
    wn.title("Mario vs the turtles")
    wn.bgcolor("white")
    border_pen = turtle.Turtle()
    border_pen.speed(0)
    border_pen.color("black")
    border_pen.penup()
    border_pen.setposition(-350,-350)
    border_pen.pendown()
    border_pen.pensize(3)
    for side in range (4):
        border_pen.fd(600)
        border_pen.lt(90)
    border_pen.hideturtle()
    score_mario=0
    hearts_mario=3
    #score
    score = turtle.Turtle()
    score.speed(0)
    score.color("black")
    score.penup()
    score.hideturtle()
    score.goto(50,300)
    score.pendown()
    score.write("Score: 0 Hearts: 3", align="center", font=("Courier", 24, "normal"))
    #Main game loop
    #color of the turtle, speed, two variables for the position
    mario=turtle.Turtle()
    mario.shape("turtle")
    colors = ['red', 'blue', 'green', 'purple', 'yellow', 'orange', 'black']
    mario.penup()
    mario.hideturtle()
    mario.goto(-320,-320)
    mario.showturtle()
    simon=turtle.Turtle()
    simon.shape("turtle")
    simon.color("black")
    simon.penup()
    simon.hideturtle()
    simon.setposition(-270,-320)
    simon.showturtle()
    while hearts_mario>0:
     mario.ycor==simon.ycor
    x,y=mario.position()
    x,y=simon.position()
    while simon.xcor<500 and simon.xcor>-500:
        simon.setheading(180)
        mario.forward(100)
    mario.speed(0)
    mario.shapesize(stretch_wid=1, stretch_len=1)


    def jump():
        cor1=mario.ycor()
        cor1+=10
        mario.delay=2
        mario.setposition(x,cor1)
        cor1-=10
        mario.setposition(x,cor1)


    def left():
        mario.setheading(180)
        mario.forward(100)


    def right():
        mario.setheading(0)
        mario.forward(100)


    def escape():
        wn.bye()


    def reset():
        mario.reset()
    if mario.xcor==simon.xcor and mario.ycor==simon.ycor:
         hearts_mario=2

    #all these functions are for movement/boundaries
    #boundaries
    if mario.xcor<=border_pen.xcor and mario.ycor<=border_pen.ycor:
         mario.setposition(250,250)



    if  mario.setheading(180) and mario.forward (100):
        turtle.register_shape("marioleft.gif")
        mario.shape("marioleft.gif")

    turtle.onkey(left, "Left")
    turtle.onkey(right, "Right")
    turtle.onkey(escape, "Escape")
    turtle.onkey(reset, "r")
    turtle.onkey(jump, "space")
    turtle.listen()
    turtle.mainloop()