How do you implement a Progress Bar

[J Wolfe]

I would really appreciate some help with this.  I'm fairly new to
using classes...What am I doing wrong? All I get is a blank window. I
can't seem to figure out how to initialize this Progress Bar.

Thanks,
Jonathan



##############################file Meter.py####################
from Tkinter import *

class Meter(Frame):
	'''A simple progress bar widget.'''
	def __init__(self, master, fillcolor='orchid1', text='',value=0.0,
**kw):
		Frame.__init__(self, master, bg='white', width=350,height=20)
		self.configure(**kw)
		self._c = Canvas(self, bg=self['bg'],width=self['width'],
height=self['height'],highlightthickness=0, relief='flat',bd=0)
		self._c.pack(fill='x', expand=1)
		self._r = self._c.create_rectangle(0, 0, 0, int(self['height']),
fill=fillcolor, width=0)
		self._t = self._c.create_text(int(self['width'])/2,
int(self['height'])/2, text='')
		self.set(value, text)

	def set(self, value=0.0, text=None):
		#make the value failsafe:
		if value < 0.0:
			value = 0.0
		elif value > 1.0:
			value = 1.0
		if text == None:
		#if no text is specified get the default percentage string:
			text = str(int(round(100 * value))) + ' %'
			self._c.coords(self._r, 0, 0, int(self['width']) * value,
int(self['height']))
			self._c.itemconfigure(self._t, text=text)



root=Tk()
f=Meter(root)
for i in range(100):
	f.set(i,"Hello")
	print i
mainloop()