Turtle() 只听一次 onkeypress，不重复按键答案

【问题标题】：Turtle() only listening to onkeypress one time, not repeating keysTurtle() 只听一次 onkeypress，不重复按键
【发布时间】：2021-07-18 19:15:56
【问题描述】：

所以我正在制作蛇，每当我按下按键时，它就可以正常工作一次。我可以上一次，下一次，左右一次。但是如果我想再次使用这个键改变方向我不能，有人知道为什么吗？这是我的代码（也是 mainloop 导致我的海龟不显示）：

from turtle import *
from turtle import Screen
from snake import Snake
import random 
import time 

screen = Screen() ## the window that shows up

screen.setup(800,800) ## height and width to 800
screen.bgcolor("black") ## black GUI
screen.title("G5's Snake Game") ## name our game 
screen.tracer(0) ## eliminates delay from snake, molds it all into one picture

snake = Snake()

screen.onkeypress(snake.up, "Up")
screen.onkeypress(snake.down, "Down")
screen.onkeypress(snake.left, "Left")
screen.onkeypress(snake.right, "Right")
screen.listen()
screen.listen()


gameon = True 

while gameon: ## make this snake.move() method !    
    screen.update()
    time.sleep(0.1)
    snake.move()




screen.exitonclick()

【问题讨论】：

标签： python user-interface screen turtle-graphics listen

【解决方案1】：


screen.onkeypress(snake.up, "Up")
screen.onkeypress(snake.down, "Down")
screen.onkeypress(snake.left, "Left")
screen.onkeypress(snake.right, "Right")
screen.listen()
screen.listen()

上面的块需要移动到一个while循环中。现在，它会检查用户是否按下过某个键。如果他们这样做了，它将向下移动到 while 循环。

while gameon:
    screen.onkeypress(snake.up, "Up")
    screen.onkeypress(snake.down, "Down")
    screen.onkeypress(snake.left, "Left")
    screen.onkeypress(snake.right, "Right")
    screen.listen()
    screen.listen()

【讨论】：