Tkinter in while loop

[Woody_99]

Hello,
i am writing a GUI programm with Tkinter. I dont want to use the tk.mainloop(), course it is in an While loop. I want to use tk.update_idletasks() or tk.update(). but when i try it, I get the folloing message:

Traceback (most recent call last):
File "C:\Users\XXX\AppData\Local\Programs\Python\Python36-32\Programme\Hello World.py", line 51, in <module>
tk.update()
AttributeError: module 'tkinter' has no attribute 'update'

What can i do?

Thanks, Woody

[paddyg]

Maybe there's some useful info in the code you run prior to your error message. On the RPi3 if I startx, then a terminal, then python3 I can

Code: Select all

pi@raspberrypi:~ $ python3
Python 3.5.3 (default, Jan 19 2017, 14:11:04) 
[GCC 6.3.0 20170124] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tkinter
>>> tk = tkinter.Tk()
>>> tk.update()
>>> 

and it seems to work ok

[Paeryn]

Code: Select all

    tk.update()
AttributeError: module 'tkinter' has no attribute 'update'

From the error message it looks like tk is the name you gave when you imported tkinter rather than the name of the top-level widget, e.g. you have something like

Code: Select all

import tkinter as tk

tkroot = tk.Tk()

tk.update()  ## Should be tkroot.update()

[Davies]

in your other post you use root,

Code: Select all

import tkinter as tk
        root=tk.Tk()
        root.attributes('-fullscreen', True)
        root.wm_title("Glashaus") # Fenster Titel
        root.config(background = "#FFFFFF") # Hintergrundfarbe des Fenster
    root.mainloop()

call root what you want but youll need to call the same name throughout, or dont call a name and have everything referred to as tk as in paddy's example

[scotty101]

i am writing a GUI programm with Tkinter. I dont want to use the tk.mainloop(), course it is in an While loop. I want to use tk.update_idletasks() or tk.update(). but when i try it, I get the folloing message:

REALLY BAD IDEA IMO.
I can't think of any reason why you wouldn't want to use mainloop() or why the existing methods of periodically scheduling function calls wouldn't be adequate for your needs.

[B.Goode]

i am writing a GUI programm with Tkinter. I dont want to use the tk.mainloop(), course it is in an While loop. I want to use tk.update_idletasks() or tk.update(). but when i try it, I get the folloing message:

REALLY BAD IDEA IMO.
I can't think of any reason why you wouldn't want to use mainloop() or why the existing methods of periodically scheduling function calls wouldn't be adequate for your needs.

Probably my fault...

In this duplicate thread viewtopic.php?f=32&t=197690 I suggested that putting mainloop() in a while: loop might Not Be A Good Idea.

Clearly there are two broad options for resolving that. @Woody_99 has opted for the one that is less appropriate...

[paddyg]

In pi3d there was a decision (before I was involved so don't know all details) that it would be nice to allow tkinter to supply the graphical drawing surface as well as mouse and keyboard stuff. Because this was optional, the main pi3d display loop called tk.update() if required. However in the demo using Qt you will see that the main loop in controlled by the GUI app and the pi3d.Display.loop_running() call is done from a timer. However with the PyGTK version of the same demo I struggled to get this mechanism to work and had to call gtk functions from the pi3d loop. Horses for courses I suppose, but better to use the tkinter looping until you hit a major problem.