#!/usr/bin/env python3
#-*- coding:utf-8 -*-

import tkinter as tk
from tkinter import ttk

class HolaMundoApp(ttk.Frame):
    '''Clase que define una ventana que muestra el "Hola mundo"'''
    
    def __init__(self, master=None):
        ttk.Frame.__init__(self, master)
        
        #Creamos un label
        o = ttk.Label(self, text='Hola PyAr!', anchor='center')
        #Lo agregamos a la ventana.
        o.pack(fill='both', expand=True)
        #Agregamos este frame a la ventana principal (Top level window)
        self.pack(fill='both', expand=True)
        
        #Configuramos la ventana principal
        top = self.winfo_toplevel()
        top.title('Hola mundo')
        top.minsize(width=300, height=200)
        

if __name__ == '__main__':
    app = HolaMundoApp()
    app.mainloop()