为什么我总是收到 Python Turtle 的终止符错误？

Question

我正在编写一个简单的控制台应用程序，您可以在其中键入命令。一个这样的命令包括：draw。 draw 使用 Python turtle 模块和我自己模块中的一些函数。这是我的主要代码（其中一些被屏蔽了，因为它不处理 draw 命令）：

import os
import datetime
import webbrowser
import random
import turtle
import functions as fn  # grabs functions from functions.py
import text_colors as txt

is_running = True

while is_running:
        [some code...]
        elif commands[0].lower() == "draw":
        try:
            t = turtle.Turtle()
            if commands[1].lower() == "square":
                fn.draw_rect(t)
            elif commands[1].lower() == "circle":
                fn.draw_circle(t)
            elif commands[1].lower() == "triangle":
                fn.draw_triangle(t)
            else:
                txt.print_red("Invalid shape!")
            turtle.done()
        except IndexError:
            txt.print_red("No shape was provided!")
        [some more code...]

这是定义我的函数的模块：

import turtle
import time


def draw_rect(t):

    for i in range(0, 4):
        t.forward(100)
        t.right(90)

    time.sleep(3)
    turtle.clearscreen()


def draw_circle(t):

    t.circle(50)

    time.sleep(3)
    turtle.clearscreen()


def draw_triangle(t):

    t.forward(100)

    for i in range(0, 2):
        t.left(120)
        t.forward(100)

    time.sleep(3)
    turtle.clearscreen()

当我运行它时，控制台运行很好，当我输入 draw square 打开 Turtle 并画一个正方形时，它运行s刚刚好。但是，当我关闭 Turtle 并重新键入 draw square 时，我得到了这个大错误：

Traceback (most recent call last):
  File "kshell_base.py", line 209, in <module>
    t = turtle.Turtle()
  File "C:\Users\keega\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 3813, in __init__
    RawTurtle.__init__(self, Turtle._screen,
  File "C:\Users\keega\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 2557, in __init__
    self._update()
  File "C:\Users\keega\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 2660, in _update
    self._update_data()
  File "C:\Users\keega\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 2646, in _update_data
    self.screen._incrementudc()
  File "C:\Users\keega\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 1292, in _incrementudc
    raise Terminator
turtle.Terminator

我已经尝试将 turtle.done() 附加到每个函数的末尾，但它仍然给我这个异常。请帮忙！我仍然需要它才能绘图，这不是我想在我的代码中出现的错误。

Answer 1

我想通了！您必须在代码中使用 turtle.TurtleScreen._RUNNING = True 。这是我的新代码（主要代码）：

import os
import datetime
import webbrowser
import random
import turtle
import functions as fn  # grabs functions from functions.py
import text_colors as txt

is_running = True

while is_running:
        [some code...]
        elif commands[0].lower() == "draw":
            try:
                if commands[1].lower() == "square":
                    t = turtle.Turtle()
                    fn.draw_rect(t)
                elif commands[1].lower() == "circle":
                    t = turtle.Turtle()
                    fn.draw_circle(t)
                elif commands[1].lower() == "triangle":
                    t = turtle.Turtle()
                    fn.draw_triangle(t)
                else:
                    txt.print_red("Invalid shape!")
            except IndexError:
                txt.print_red("No shape was provided!")
        [some more code...]

这是我的新模块代码：

import turtle
import time


def draw_rect(t):
    for i in range(0, 4):
        t.forward(100)
        t.right(90)

    time.sleep(3)
    turtle.clearscreen()
    t.screen.exitonclick()
    turtle.TurtleScreen._RUNNING = True


def draw_circle(t):
    t.circle(50)

    time.sleep(3)
    turtle.clearscreen()
    t.screen.exitonclick()
    turtle.TurtleScreen._RUNNING = True


def draw_triangle(t):
    t.forward(100)

    for i in range(0, 2):
        t.left(120)
        t.forward(100)

    time.sleep(3)
    turtle.clearscreen()
    t.screen.exitonclick()
    turtle.TurtleScreen._RUNNING = True

现在，如果您在键入 draw square 或其他内容后关闭乌龟 window，然后重新键入 draw 命令，它会毫无怨言地执行。

为什么我总是收到 Python Turtle 的终止符错误？

Why do I keep getting a Terminator error for Python Turtle?

python

exception

python-3.x

python-turtle