Python Turtle 键绑定只能工作一次

Question

我试图用 turtle 创建一个简单的键盘绘图程序，以保存您的绘图供以后使用，但是当尝试使用键绑定四处移动时，我只能移动一次。

我是运行 Windows 10。我正在为我构建的名为 Ren 的渲染引擎编写此代码，该引擎使用此文件格式来渲染形状。

这是我的代码：

import turtle
from tkinter.filedialog import *

s = turtle.Screen()
s.title("Ren Poly Editor")

t = turtle.Turtle()

fileName = askopenfilename()

with open(fileName) as file:
    rendataLayer1 = file.read().split("\n")
    rendata = []
    for i in rendataLayer1:
        if not i.startswith("#") and i:
            rendata.append(str(i.split()))

t.color("black")

for i in rendata:
    i = eval(i)

    print(i[0] + " " + i[1])

    if i[0] == "cl":
        t.color(i[1])

    elif i[0] == "fd":
        t.fd(int(i[1]))

    elif i[0] == "bk":
        t.back(int(i[1]))

    elif i[0] == "lt":
        t.lt(int(i[1]))

    elif i[0] == "rt":
        t.rt(int(i[1]))

def fd():
    distance = s.textinput("Forward", "How far?")

    t.fd(int(distance))

    with open(fileName, "a") as file:
        file.write("fd " + distance + "\n")

def bk():
    distance = s.textinput("Backward", "How far?")

    t.back(int(distance))

    with open(fileName, "a") as file:
        file.write("bk " + distance + "\n")

def lt():
    distance = s.textinput("Forward", "How much?")

    t.lt(int(distance))

    with open(fileName, "a") as file:
        file.write("lt " + distance + "\n")

def rt():
    distance = s.textinput("Forward", "How much?")

    t.rt(int(distance))

    with open(fileName, "a") as file:
        file.write("rt " + distance + "\n")


s.onkeypress(fd, "Up")
s.onkeypress(bk, "Down")
s.onkeypress(lt, "Left")
s.onkeypress(rt, "Right")
s.listen()

s.mainloop()

Answer 1

每当您在 Python 乌龟（或类似的 numinput()）中调用 textinput() 方法时，它都会撤消您的 listen() 调用，因为 window弹出接受输入成为监听器。只需在每次调用 textinput() 后添加另一个 listen() 调用，事情就会如您所愿。

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