### 16.1.2.2 A Simple Hello World Program

      from Tkinter import *

      class Application(Frame):
          def say_hi(self):
              print "hi there, everyone!"

          def createWidgets(self):
              self.QUIT = Button(self)
              self.QUIT["text"] = "QUIT"
              self.QUIT["fg"]   = "red"
              self.QUIT["command"] =  self.quit

              self.QUIT.pack({"side": "left"})

              self.hi_there = Button(self)
              self.hi_there["text"] = "Hello",
              self.hi_there["command"] = self.say_hi

              self.hi_there.pack({"side": "left"})

          def __init__(self, master=None):
              Frame.__init__(self, master)
              self.pack()
              self.createWidgets()

      app = Application()
      app.mainloop()