Error With move function Tkinter

Question

I'm using python 3.4.1 with windows and when I close my Tkinter I obtain an error message about move tkinter function. The app works fine, but when I close my app the shell reports me this bug message:

C:\Python34\python.exe "E:/ProgramasPython3/Programas TKinter/JuegoPong/Pong.py"
Traceback (most recent call last):
  File "E:/ProgramasPython3/Programas TKinter/JuegoPong/Pong.py", line 96, in <module>
    main()
  File "E:/ProgramasPython3/Programas TKinter/JuegoPong/Pong.py", line 89, in main
    pelota.dibujar()
  File "E:/ProgramasPython3/Programas TKinter/JuegoPong/Pong.py", line 35, in dibujar
    self.canvas.move(self.id, self.x, self.y)
  File "C:\Python34\lib\tkinter\__init__.py", line 2398, in move
    self.tk.call((self._w, 'move') + args)
_tkinter.TclError: invalid command name ".42952128"

Process finished with exit code 1

This is my code:

#!/usr/bin/env python34

from tkinter import (Tk, Frame, Canvas)
import random
import time as time


class Pelota(Frame):
    def __init__(self, canvas, raqueta,  color):
        Frame.__init__(self, master=None)
        self.canvas = canvas
        self.raqueta = raqueta
        self.color = color
        self.id = self.canvas.create_oval(10.0, 10.0, 25.0, 25.0, fill=self.color)
        self.canvas.move(self.id, 245.0, 100.0)
        empezar = [-3, -2, -1, 0, 1, 2, 3]
        random.shuffle(empezar)
        self.x = empezar[0]
        self.y = -3.0
        self.canvas_height = self.canvas.winfo_reqheight()
        self.canvas_width = self.canvas.winfo_reqwidth()

    def golpea_raqueta(self, pos):
        raqueta_pos = self.canvas.coords(self.raqueta.id)
        if pos[2] >= raqueta_pos[0] and pos[0] <= raqueta_pos[2]:
            if raqueta_pos[1] <= pos[3] <= raqueta_pos[3]:
                return True
        return False

    def dibujar(self):
        self.canvas.move(self.id, self.x, self.y)
        pos = self.canvas.coords(self.id)
        if pos[1] <= 0.0:
            self.y = 3.0
        elif pos[3] >= self.canvas_height:
            self.y = -3.0
        elif self.golpea_raqueta(pos):
            self.y = -3.0
        elif pos[0] <= 0.0:
            self.x = 3.0
        elif pos[2] >= self.canvas_width:
            self.x = -3.0


class Raqueta(Frame):
    def __init__(self, canvas, color):
        Frame.__init__(self, master=None)
        self.canvas = canvas
        self.color = color
        self.x = 0.0
        self.id = self.canvas.create_rectangle(0.0, 0.0, 100.0, 10.0, fill=self.color)
        self.canvas.move(self.id, 200.0, 300.0)
        self.canvas_width = self.canvas.winfo_reqwidth()
        self.canvas.bind_all('<KeyPress-Left>', self.to_left)
        self.canvas.bind_all('<KeyPress-Right>', self.to_right)

    def dibujar(self):
        self.canvas.move(self.id, self.x, 0.0)
        pos = self.canvas.coords(self.id)
        if pos[0] <= 0.0:
            self.x = 0.0
        elif pos[2] >= self.canvas_width:
            self.x = 0.0

    def to_left(self, evt):
        self.x = -2.0

    def to_right(self, evt):
        self.x = 2.0


def main():
    tk = Tk()

    tk.title('Mi Pong')

    canvas = Canvas(tk, width=500, height=400, bd=0, highlightthickness=0)
    raqueta = Raqueta(canvas, 'blue')
    pelota = Pelota(canvas, raqueta, 'red')
    tk.resizable(0, 0)
    tk.wm_attributes('-topmost', 1)
    tk.update()
    canvas.pack()
    while 1:
        pelota.dibujar()
        raqueta.dibujar()
        tk.update_idletasks()
        tk.update()
        time.sleep(0.01)


main()

The App is an easy Pong game.

Pelota is Ball Raqueta is Tennis Racket dibujar is plot golpea raqueta is knock tennis racket

Thanks

The while loop at the end tries to do another update after the GUI elements have been disposed. — tobias_k
– tobias_k, Commented Jul 16, 2014 at 10:04
@tobias_k If i comment the update the program not work and not solve the problem. — Tobal
– Tobal, Commented Jul 16, 2014 at 10:08
Don't comment the entire loop. A quick-and-dirty solution would be just to put that loop into a try/except, so the error is not shown. After all, as you said, it works nonetheless. A cleaner solution would be to do away with that loop and use the after method of tkinter widgets instead, to have them update themselves. — tobias_k
– tobias_k, Commented Jul 16, 2014 at 10:10

Padraic Cunningham · Accepted Answer · 2014-07-16 10:11:06Z

1

I imagine you can find a nicer way but putting it in a try/except will end without any error.

     while 1:
        try:
            pelota.dibujar()
            raqueta.dibujar()
            tk.update_idletasks()
            tk.update()
            time.sleep(0.01)
        except Exception as e:
            break

answered Jul 16, 2014 at 10:11

Padraic Cunningham

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