How can I prevent a window from being resized with tkinter?

Question

I have a program which creates a window where a message is displayed according to a check box.

How can I make the window size constant when the message is displayed and the message is not displayed?

from Tkinter import *

class App:
    def __init__(self,master):
        self.var = IntVar()
        frame = Frame(master)
        frame.grid()
        f2 = Frame(master,width=200,height=100)
        f2.grid(row=0,column=1)
        button = Checkbutton(frame,text='show',variable=self.var,command=self.fx)
        button.grid(row=0,column=0)
        msg2="""I feel bound to give them full satisfaction on this point"""
        self.v= Message(f2,text=msg2)
    def fx(self):
        if self.var.get():
            self.v.grid(column=1,row=0,sticky=N)
        else:
            self.v.grid_remove()

top = Tk()
app = App(top)            
top.mainloop()

Answer 1

This code makes a window with the conditions that the user cannot change the dimensions of the Tk() window, and also disables the maximise button.

import tkinter as tk

root = tk.Tk()
root.resizable(width=False, height=False)
root.mainloop()

Within the program you can change the window dimensions with @Carpetsmoker's answer, or by doing this:

root.geometry('{}x{}'.format(<widthpixels>, <heightpixels>))

It should be fairly easy for you to implement that into your code. :)