### 20.1.2.2 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()

    root = Tk()
    app = Application(master=root)
    app.mainloop()
    root.destroy()