Tkinter - how to disable an existing button

Question

I am trying to disable a button using Tkinter:

from Tkinter import *
import os


class OptionWindow:




    def __init__(self, value):

        self.master = Tk() 
        self.master.minsize(500,500)
        self.b1 = Button(self.master, text = "save Game", command =self.saveGame, state = NORMAL).grid(row = 0, column = 1, sticky = W)

   def saveGame(self):       
        from modules.startingKit import options
        options.saved = True
        self.b1.configure (state = DISABLED)

Yet, for some reason, when I press the "save Game" button, its appearance does not change. What must I do to disable it?

Not sure if it matters: Have you started the mainloop? self.master.mainloop() as the last thing in your __init__ function. Or bring the Tk() instance as a parameter to OptionWindow's constructor and pass it to self.master. — Sami N
– Sami N, Commented Mar 28, 2013 at 20:25

Bryan Oakley · Accepted Answer · 2013-03-28 20:26:32Z

4

You are making a very common mistake, probably because there are several tutorials on the internet which make this same mistake.

In python, if you do x=foo().bar(), x is given the result of bar(). In your code you're doing self.b=Button(...).grid(...). Thus, self.b is set to the result of grid(...). grid(...) always returns None. Because of that, doing self.b.configure(...) is the same as doing None.configure(...) which obviously is not going to do what you think it is going to do.

The solution is to do widget creation and widget layout in separate steps:

self.b1 = Button(...)
self.b1.grid(...)

answered Mar 28, 2013 at 20:26

Bryan Oakley

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