通过 tkinter 中的按钮关闭乌龟窗口后再次调用乌龟窗口时出错

Question

以下代码是 tkinter 窗口，其中包含一个调用海龟窗口的按钮

import tkinter
from tkinter import *
from turtlefunc import *
root = Tk()

#creating a button
myButton = Button(root, text="call turtle",command =call)
myButton.pack()

root.mainloop()

以下是海龟窗口的代码

import turtle
def call():
    t = turtle.Turtle()
    screen = turtle.Screen()
    screen.bgcolor('white')
    t.width(3)
    for i in range(1,5):
        t.forward(20)
        t.left(90)
    t.hideturtle()
    turtle.exitonclick()

按钮第一次运行正常，但第二次调用海龟窗口或函数时返回错误

错误：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\sharmila\AppData\Local\Programs\Python\Python38\lib\tkinter\__init__.py", line 1883, in __call__
    return self.func(*args)
  File "C:\Users\sharmila\PycharmProjects\GAME ARCADE GUI\turtlefunc.py", line 3, in call
    t = turtle.Turtle()
  File "C:\Users\sharmila\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 3813, in __init__
    RawTurtle.__init__(self, Turtle._screen,
  File "C:\Users\sharmila\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 2557, in __init__
    self._update()
  File "C:\Users\sharmila\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 2660, in _update
    self._update_data()
  File "C:\Users\sharmila\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 2646, in _update_data
    self.screen._incrementudc()
  File "C:\Users\sharmila\AppData\Local\Programs\Python\Python38\lib\turtle.py", line 1292, in _incrementudc
    raise Terminator
turtle.Terminator

Answer 1

你必须.clear()你的画布在你销毁它之前，所以所有的海龟都不在等式中。这样，当它不再看到 TurtleScreen._RUNNING 时，它不会引发 Terminator

#! /usr/bin/python3

import tkinter as tk
import turtle as trt

title = 'Python Turtle'
root  = tk .Tk() ; root .title( title )

Width, Height  = 500, 500
myButton = None  ##  empty, forward declaration

def call():
    myButton .pack_forget()  ##  hide button
    canvas  = tk .Canvas( root, width=Width, height=Height )
    canvas .pack()  ##  show canvas
    turtle  = trt .RawTurtle( canvas=canvas )
    screen  = turtle .getscreen()
    screen .bgcolor('white')
    turtle .width( 3 )
    for i in range( 1, 5 ):
        turtle .forward( 20 )
        turtle .left( 90 )
    turtle .hideturtle()
    def dest( x, y ):
        screen .clear()  ##  destroy turtles
        canvas .destroy()
        myButton .pack()  ##  show button again
    screen .onclick( dest )

##  creating a button
myButton = tk .Button( root,  text='call turtle',  width=len(title) +10,  command=call )
myButton .pack()

root .mainloop()

不过，您实际上并不需要每次都“销毁”画布并重新构建它。您可以在不使用时“隐藏”它。

#! /usr/bin/python3

import tkinter as tk
import turtle as trt

title = 'Python Turtle'
root  = tk .Tk() ; root .title( title )

Width, Height  = 500, 500
canvas  = tk .Canvas( root, width=Width, height=Height )
myButton = None  ##  empty, forward declaration

def call():
    myButton .pack_forget()  ##  hide button
    canvas .pack()  ##  show canvas
    turtle  = trt .RawTurtle( canvas=canvas )
    screen  = turtle .getscreen()
    screen .bgcolor('white')
    turtle .width( 3 )
    for i in range( 1, 5 ):
        turtle .forward( 20 )
        turtle .left( 90 )
    turtle .hideturtle()
    def dest( x, y ):
        screen .clear()  ##  destroy turtles
        canvas .pack_forget()  ##  hide canvas, so you can reuse it later
        myButton .pack()  ##  show button again
    screen .onclick( dest )

##  creating a button
myButton = tk .Button( root,  text='call turtle',  width=len(title) +10,  command=call )
myButton .pack()

root .mainloop()

Answer 2

该模块使用一个类变量 _RUNNING，当像这样运行时，它在执行之间保持为真。我已请求通过拉取请求更新模块。

同时，解决/工作示例

1)

import importlib
import turtle
def call():
    importlib.reload(turtle)
    screen = turtle.Screen()
    screen.bgcolor('white')
    t = turtle.Turtle()
    t.width(3)
    for i in range(1,5):
        t.forward(20)
        t.left(90)
    t.hideturtle()
    turtle.exitonclick()

import turtle
def call():
    screen = turtle.Screen()
    turtle.TurtleScreen._RUNNING=True
    screen.bgcolor('white')
    t = turtle.Turtle()
    t.width(3)
    for i in range(1,5):
        t.forward(20)
        t.left(90)
    t.hideturtle()
    turtle.exitonclick()