無法使用用戶輸入 python 龜停止循環

Question

這是我使用 python 龜 package 的代碼：

#setup
import turtle
wn = turtle.Screen()
obj = turtle.Turtle()
go = True


def restart(x, y, go = go):
    go = False
    print(go)
wn.onscreenclick(restart)
wn.listen()

#main loop
while go:
    wn.update()
    obj.forward(0.1)

print("game ended")

當我單擊屏幕時，它應該停止執行代碼。 循環不會停止，也不會說“游戲結束”，我不知道為什么。

我需要幫助。 謝謝！

Answer 1

You're defining a local variable go in your restart function, when you set it to False you are only changing the local variable's value not the go variable from the outer scope

def restart(x, y, go=go):  # This keyword argument is creating a local variable

只需刪除參數，然后您將修改正確的變量

def restart(x, y):
    go = False

Answer 2

除了@IainShelvington 指出的全局變量問題，我建議您重新設計程序以使用海龜計時器事件：

from turtle import Screen, Turtle

def restart(x, y):
    global running
    running = False

def move():
    if running:
        turtle.forward(0.1)
        screen.ontimer(move)
    else:
        screen.bye()

turtle = Turtle()

screen = Screen()
screen.onscreenclick(restart)

running = True

move()

screen.mainloop()

print("game ended")