#! /usr/bin/python

import Tkinter, thread, time

class MyLab:
	DATA = 'this is the marquee message! '
	START = 'start marquee'
	STOP = 'stop marquee'
	def __init__(self, master):
		self.looping = 1
		self.frame = Tkinter.Frame(master)
		self.mylabel = Tkinter.Label(self.frame, text = MyLab.DATA, background = 'white')	
		self.start = Tkinter.Button(self.frame, text = MyLab.START, command = self.startit)	
		
		self.mylabel.pack()
		self.start.pack()
		self.frame.pack()
		
	def startit(self):
		if (self.start['text'] == MyLab.START):
			self.looping = 1
			self.start['text'] = MyLab.STOP
			thread.start_new_thread(self.marquee, ())
		else:
			self.looping = 0
			self.start['text'] = MyLab.START	
	
	def marquee(self):
		while self.looping:
			self.text = self.mylabel['text'][-1] + self.mylabel['text'][:-1]
			self.mylabel['text'] = self.text	
			time.sleep(.2)	
		
root = Tkinter.Tk()

mymar = MyLab(root)

root.mainloop()