### 16.1.2.2 A Simple Hello World Program

      from Tkinter import *                                                    1
                                                                               2
      class Application(Frame):                                                3
          def say_hi(self):                                                    4
              print "hi there, everyone!"                                      5
                                                                               6
          def createWidgets(self):                                             7
              self.QUIT = Button(self)                                         8
              self.QUIT["text"] = "QUIT"                                       9
              self.QUIT["fg"]   = "red"                                       10
              self.QUIT["command"] =  self.quit                               11
                                                                              12
              self.QUIT.pack({"side": "left"})                                13
                                                                              14
              self.hi_there = Button(self)                                    15
              self.hi_there["text"] = "Hello",                                16
              self.hi_there["command"] = self.say_hi                          17
                                                                              18
              self.hi_there.pack({"side": "left"})                            19
                                                                              20
                                                                              21
          def __init__(self, master=None):                                    22
              Frame.__init__(self, master)                                    23
              self.pack()                                                     24
              self.createWidgets()                                            25
                                                                              26
      app = Application()                                                     27
      app.mainloop()                                                          28