How to refresh the GUI window in Tkinter

Question

Im trying to make a simple GUI with Tkinker that, when you press a button it adds 1 to the text on a label. However, the label simply remains at 0. Is there a way I can refresh it so it stays up-to-date?

heres what i have so far:

from Tkinter import * clicks = 0 def click(): global clicks global Window clicks += 1 print 'ok', clicks def close_window(): global Window Window.destroy() Window = Tk() Number = Label(text = clicks) close = Button(Window , text='exit' , command = close_window) button = Button(Window,text = 'clickme' ,command = click) button.pack() close.pack() Number.pack() Window.mainloop()

falsetru · Accepted Answer · 2013-12-14 05:24:16Z

clicks += 1 only changes the variable clicks.

Use Label.config(text=...) or Label['text'] = ... to change the label text.

def click(): global clicks clicks += 1 Number.config(text=clicks) # <------ print 'ok', clicks

Erik Johnson · Accepted Answer · 2013-12-14 05:31:50Z

0

You almost have it, but for your label you don't want to use "text", you want "textvariable". However, this takes a StringVar as a variable, which forces a little bit of busywork:

Window = Tk() strclicks = StringVar() Number = Label(textvariable=clicks)

and within click():

 clicks += 1 strclicks.set(clicks)

Using "text" evaluates the variable at creation; "textvariable" updates the label when the variable updates.

edited Dec 14, 2013 at 5:31

answered Dec 14, 2013 at 5:22

Erik Johnson

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2 Comments

Bryan Oakley Over a year ago

For such a simple problem, IMO a textvariable is overkill. Whether with or without a textvariable, updating requires a function call (either widget.configure or variable.set). The use of a textvariable requires an extra object while providing no real advantage over just directly configuring the label.

Erik Johnson Over a year ago

@BryanOakley That's a reasonable position. Before I started on Python, I was a long-time Tcl user, so my attitude towards textvariable is influenced by that. In Tcl, the variable doesn't need to be a special object and it just works, no call necessary. I actually wrote my answer up like that before the other answer went live, went to test it as confirmation, and re-discovered the need for the StringVar. I edited my answer to use the StringVar and actually be correct, but I have to agree that using .config is simpler for this case.

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