old_contents: #! /usr/bin/env python
  import Tkinter as tk
  
  class PongGame(tk.Frame):
      def __init__(self, master=None):
          tk.Frame.__init__(self, master)
          self.grid()
          self.createWidgets()
          
  
      def createWidgets(self):
          self.quitButton = tk.Button(self, text = 'Quit',
                                      command=self.quit)
          self.playArea = tk.Canvas(bg='white', height=850, width = 1150)
          self.playArea.grid(padx=25, pady=15)
          self.quitButton.grid()
  
  pong = PongGame()
  pong.master.geometry("1200x900+300+300")
  pong.master.title('Game of Pong')
  pong.mainloop()
  
new_contents: #! /usr/bin/env python
  import Tkinter as tk
  
  class PongGame(tk.Frame):
      FIELD_HEIGHT = 850
      FIELD_WIDTH = 1150
  
      def __init__(self, master=None):
          tk.Frame.__init__(self, master)
          self.grid()
          self.createWidgets()
          
  
      def createWidgets(self):
          self.quitButton = tk.Button(self, text = 'Quit',
                                      command=self.quit)
          self.playArea = tk.Canvas(bg='white', height=self.FIELD_HEIGHT, 
                                    width = self.FIELD_WIDTH)
          self.playArea.grid(padx=25, pady=15)
          self.quitButton.grid()
  
  pong = PongGame()
  pong.master.geometry("1200x900+300+300")
  pong.master.title('Game of Pong')
  pong.mainloop()
  
  
  #online submission url - http://www.codeskulptor.org/#user39_wJkf7WYddA_7.py
  
subject: update codeskulptor.org url for online submission