# -*- coding: utf-8 -*-

from tkinter import *

import tkinter.messagebox as messagebox

class Application(Frame):

def __init__(self, master = None):

Frame.__init__(self, master)

self.pack()

self.createWidgets()

def createWidgets(self):

self.helloLabel = Label(self, text = 'Hello, world!')

self.helloLabel.pack()

self.quitButton = Button(self, text = 'Quit', command = self.quit)

self.quitButton.pack()

self.nameInput = Entry(self)

self.nameInput.pack()

self.alertButton = Button(self, text = 'Hello', command = self.hello)

self.alertButton.pack()

def hello(self):

name = self.nameInput.get() or 'world'

messagebox.showinfo('Message', 'Hello %s' % name)

app = Application()

app.master.title('Hello World')

app.mainloop()