用按键停止python turtle

Question

当我按下逃生键时，我试图让乌龟停止前进。当我按escape时，什么也没发生！谁能告诉我为什么？如能找到解决办法，将不胜感激

import turtle
screen = turtle.Screen()

running = True

def stop():
        running = False
        print(running)

while running:
        turtle.forward(1)
        screen.onkey(stop, "Esc")
        screen.listen()

Answer 1

我发现你的代码有几个问题。主语句是stop()中缺少的global语句。第二部分包括：混合turtle函数和对象API；使用键名“Esc”而不是“Escape”；把onkey()和listen()放在一个循环中；并可能使用while循环阻止事件

我相信此代码应该满足您的要求：

from turtle import Screen, Turtle

running = True

def stop():
    global running

    running = False

def run():
    if running:
        turtle.forward(1)
        screen.ontimer(run)

screen = Screen()
screen.onkey(stop, 'Escape')
screen.listen()

turtle = Turtle()

run()

screen.mainloop()