from Tkinter import *

class Errors:

    def __init__(self, master):
	self.button = Button(master, text="Click me...", command=self.error)
	self.button.pack()

    def error(self):
	self.error2()

    def error2(self):
	self.error3()

    def error3(self):
	raise RuntimeError, "Exception raised on purpose"