from Tkinter import *

class Counter:

'''A simple counter GUI using object-oriented programming.'''

def __init__(self, parent):

'''Create the GUI.'''

# Framework.

self.parent = parent

self.frame = Frame(parent)

self.frame.pack()

# Model.

self.state = IntVar()

self.state.set(1)

# Label displaying current state.

self.label = Label(self.frame, textvariable=self.state)

self.label.pack()

# Buttons to control application.

self.up = Button(self.frame, text='up', command=self.upClick)

self.up.pack(side='left')

self.right = Button(self.frame, text='quit', command=self.quitClick)

self.right.pack(side='left')

def upClick(self):

'''Handle click on 'up' button.'''

self.state.set(self.state.get() + 1)

def quitClick(self):

'''Handle click on 'quit' button.'''

self.parent.destroy()

if __name__ == '__main__':

window = Tk()

myapp = Counter(window)

window.mainloop()