hi guys.. im having problems with my traffic lights. i want to execute the procesing of the traffic lights infinitely (i.e red to green to red continuously). im providing my code hoping to get a positive response soon. thanks..

import Tkinter as tk
import time
import sys
import datetime as dt 
from Tkinter import *

class ElapsedTimeClock(Label): 
    def __init__(self, parent, *args, **kwargs): 
        Label.__init__(self, parent, *args, **kwargs) 
        self.lastTime = "" 
        t = time.localtime() 
        self.zeroTime = dt.timedelta(hours=t[3], minutes=t[4], seconds=t[5]) 
        self.tick() 
  
    def tick(self): 
        # get the current local time from the PC 
        now = dt.datetime(1, 1, 1).now() 
        elapsedTime = now - self.zeroTime 
        time2 = elapsedTime.strftime('%H:%M:%S') 
        # if time string has changed, update it 
        if time2 != self.lastTime: 
            self.lastTime = time2 
            self.config(text=time2) 
        # calls itself every 200 milliseconds 
        # to update the time display as needed 
        # could use >200 ms, but display gets jerky 
        self.after(200, self.tick)
        

class TrafficLight(tk.Frame):
    """inherits tk.Frame"""
    def __init__(self, parent=None):
        tk.Frame.__init__(self, parent, bg='green')
        #self.grid()
        # create a canvas to draw on
        #self.cv = tk.Canvas(self, width=260, height=280, bg='white')
        #self.cv.grid()
        
        self.make_widgets()
        #self.red_light()

    def make_widgets(self):
        canvas.create_rectangle(168, 90, 190, 140)

    def red_light(self):
        # imagine a square box with
        # upper left corner coordinates x1, y1
        # lower right corner coordinates x2, y2
        # and sides of length span for each circle
        span = 12
        x1 = 173
        y1 = 95
        x2 = x1 + span
        y2 = y1 + span
        canvas.create_oval(x1, y1, x2, y2, fill='red')
        #canvas.create_oval(x1, y1+19, x2, y2+19, fill='yellow')
        #canvas.create_oval(x1, y1+38, x2, y2+38, fill='green')
        canvas.create_oval(x1, y1+28, x2, y2+28, fill='white')


    def green_light(self):
        # imagine a square box with
        # upper left corner coordinates x1, y1
        # lower right corner coordinates x2, y2
        # and sides of length span for each circle
        span = 12
        x1 = 173
        y1 = 95
        x2 = x1 + span
        y2 = y1 + span
        #canvas.create_oval(x1, y1, x2, y2, fill='red')
        #canvas.create_oval(x1, y1+19, x2, y2+19, fill='yellow')
        canvas.create_oval(x1, y1+28, x2, y2+28, fill='green')
        canvas.create_oval(x1, y1, x2, y2, fill='white')



root=tk.Tk()
root.title("Traffic Simulation")
canvas = tk.Canvas(root, width=1000, height=400, bg="#FFFFFF")
clock = ElapsedTimeClock(root, font=('times', 12, 'bold'), bg='white') 
clock.pack(fill=BOTH, expand=1)

canvas.pack()
light = TrafficLight()
y=light.red_light()
z=light.green_light
m = light.red_light
root.after(5000,z)
root.after(10000,m)

#root.after(10000,m)
#canvas.update()

#start = time.time()
root.mainloop()
light.mainloop()

Please use code tags
[code=python] *Your code goes between these tags

[/code]

Infinite loop= while True: Put the things you want to repeat inside the loop.
Initialization goes before the loop.

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