为什么我不断收到 Python Turtle 的终结者错误？

Question

I'm writing a simple console application where you type commands. One such command includes: draw . draw uses the Python turtle module and some functions from my own module. Here's my main code (some of it's blocked out because it doesn't handle the draw command):

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...]

And here's the module where my functions are defined:

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()

When I run it, the console runs it just fine, and when I type draw square to open Turtle and draw a square, it runs just perfect. However, when I close Turtle and retype draw square , I get this big fat error:

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

I've tried appending turtle.done() to the end of each function, but yet it still gives me this exception. Please help. I still need it to be able to draw and this is not a bug I want to have in my code.

Answer 1

I figured it out! You have to use turtle.TurtleScreen._RUNNING = True in the code. Here's my new code (main code):

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...]

And here's my new module code:

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

Now, if you close the turtle window after typing draw square or something, and retype a draw command, it does it without complaining.