Python 乌龟停止倾听

Question

我想制作一个绘图应用程序，它使用 WSAD 键移动乌龟，使用 Q 和 E 键升高和降低笔，我尝试添加一个对话框以便您可以选择乌龟的颜色，但是在我改变颜色之后，乌龟不会响应 WSAD 键绑定。有人可以解释发生了什么以及如何解决这个问题吗？

代码如下：

import turtle

#WSAD to move
def up():
    char.setheading(90)
    char.forward(10)

def down():
    char.setheading(270)
    char.forward(10)

def goLeft():
    char.setheading(180)
    char.forward(10)

def goRight():
    char.setheading(0)
    char.forward(10)


#Raises and Lowers the pen
def lowerPen():
    char.pendown()
def raisePen():
    char.penup()

#change colors
def color():
    data = turtle.simpledialog.askstring("Change Color", "Change Color to:")
    char.color(data)

#Char info
char = turtle.Turtle()
char.speed(0)

screen = turtle.Screen()
screen.title("Arrow Paint")

#Make Turtle Listen to Keystrokes.
turtle.listen()

#Keybindings
turtle.onkey(color, "c")
turtle.onkey(up, "w")
turtle.onkey(down, "s")
turtle.onkey(goLeft, "a")
turtle.onkey(goRight, "d")
turtle.onkey(raisePen, "q")
turtle.onkey(lowerPen, "e")


turtle.done()

提前致谢

编辑：我也尝试用我找到的 textinput() 函数替换 turtle.simpledialog.askstring() 函数，但它仍然不会响应键绑定

Answer 1

当你这样做时：

turtle.listen()

你让乌龟 window 成为键盘事件的 侦听器 。但是当你调用时：

 data = turtle.simpledialog.askstring("Change Color", "Change Color to:")

或textinput()，弹出的window成为键盘事件的监听器。因此，当您完成用户对话框 window 后，请调用：

turtle.listen()

之后再说。这应该允许您的乌龟键盘事件像以前一样运行。修改后的代码：

from turtle import Screen, Turtle

# WSAD to move
def goUp():
    char.setheading(90)
    char.forward(10)

def goDown():
    char.setheading(270)
    char.forward(10)

def goLeft():
    char.setheading(180)
    char.forward(10)

def goRight():
    char.setheading(0)
    char.forward(10)

# Raise and Lowers the pen
def lowerPen():
    char.pendown()

def raisePen():
    char.penup()

# Change colors
def color():
    data = screen.textinput("Change Color", "Change Color to:")
    char.color(data)
    screen.listen()

screen = Screen()
screen.title("Arrow Paint")

# Char info
char = Turtle()
char.speed('fastest')

# Keybindings
screen.onkey(color, "c")

screen.onkey(goUp, "w")
screen.onkey(goDown, "s")
screen.onkey(goLeft, "a")
screen.onkey(goRight, "d")

screen.onkey(raisePen, "q")
screen.onkey(lowerPen, "e")

# Make Turtle Listen to Keystrokes.
screen.listen()

screen.mainloop()

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