import Tkinter as tki
import sys

# Practical Tkinter GUI

# This example shows the major elements of a Tkinter GUI
# - Setting up widgets
# - Arranging widgets in a geometry
# - Acting when widgets are used (e.g. buttons pressed)
# - providing feedback within the GUI's window

# Example callback routines - to run when an event occurs

def door():
        print "Selected ...", rubberduck.get()
        door.hinges += 1
        if door.hinges == 5: rubberduck.set("Please be quiet!")

def renew():
        door.hinges = 0
        rubberduck.set("woof")
        lx.config(text=["Let's try another","AND another"][renew.counter])
        renew.counter += 1
        renew.counter %= 2

door.hinges = 0
renew.counter = 0

# setting up the main frame

root = tki.Tk()
root.title("What d'you hear?")

# Setting up and positioning a label widget

lx = tki.Label(text='Enter your sound')
lx.pack(side=tki.TOP,padx=10,pady=10)

# Setting up a text entry widget, with a piece of text that relfects the variable
# called "rubberduck" within the program. Changes to the variable will be
# relected in changes the GUI shows

rubberduck = tki.StringVar()
rubberduck.set("woof")
tki.Entry(root, width=18, textvariable=rubberduck).pack(side=tki.TOP,padx=10,pady=10)

# We store both our Entry and Label widget objects into variables so that we can
# later on change the values shown / access them from within our callback routines

# Add three buttons, and define the callbacks to run if each of them is pressed

tki.Button(text='report', command=door).pack(side=tki.LEFT)
tki.Button(text='reset', command=renew).pack(side=tki.LEFT)
tki.Button(text='exit', command = sys.exit).pack(side=tki.RIGHT)
# The sys.exit call is used to exit from the program when that button is pressed

# Having set everything up, enter a loop in which we wait for an event and
# perform actions ascribed to it when the event is received. The program remains
# in mainloop and never returns to any folowing code!

root.mainloop()