ch12-p223-gui-tkinter.py

import tkinter as tk

class Applcation(tk.Frame):
     def __init__ (self, master = None):

          tk.Frame.__init__(self,master)
          self.pack()
          self.createWidgets()
          
     def createWidgets(self):
          self.hi_there = tk.Button(self)
          self.hi_there ["text"] = "Hello World \n(click me)"
          self.hi_there['command'] = self.say_hi
          self.hi_there.pack(side = 'top')

          self.QUIT = tk.Button(self,text = "QUIT",fg='red',command = root.destroy)
          self.QUIT.pack(side = 'bottom')

     def say_hi(self):
          print('Hi there, everyone!')

root = tk.Tk()
app = Applcation(master = root)
app.mainloop()