Calculadora con python 2.4

Hoy se les comparte el aplicativo en lenguaje Python 2.4 de una calculadora, usando la libreria Tkinter.

Codigo fuente:

#by Pedro Gustavo Montesinos Berrocal

from Tkinter import *

ventana = Tk()

ventana.title("Calculadora by Pedro Montesinos")

i = 0

#Entrada

e_texto = Entry(ventana, font=("calibri 20"))

e_texto.grid(row = 0, column = 0, columnspan = 4, padx = 50, pady = 5)

#funciones

def click_boton(valor):

global i

e_texto.insert(i, valor)

i+=1

def borrar():

e_texto.delete(0, END)

i = 0

def hacer_operacion():

ecuacion = e_texto.get()

resultado = eval(ecuacion)

e_texto.delete(0, END)

e_texto.insert(0, resultado)

i = 0

#Botones

boton1 = Button(ventana, text ="1", width = 5, height = 2 , command = lambda: click_boton(1))

boton2 = Button(ventana, text ="2", width = 5, height = 2 , command = lambda: click_boton(2))

boton3 = Button(ventana, text ="3", width = 5, height = 2 , command = lambda: click_boton(3))

boton4 = Button(ventana, text ="4", width = 5, height = 2 , command = lambda: click_boton(4))

boton5 = Button(ventana, text ="5", width = 5, height = 2 , command = lambda: click_boton(5))

boton6 = Button(ventana, text ="6", width = 5, height = 2 , command = lambda: click_boton(6))

boton7 = Button(ventana, text ="7", width = 5, height = 2 , command = lambda: click_boton(7))

boton8 = Button(ventana, text ="8", width = 5, height = 2 , command = lambda: click_boton(8))

boton9 = Button(ventana, text ="9", width = 5, height = 2 , command = lambda: click_boton(9))

boton0 = Button(ventana, text ="0", width = 19, height = 2 , command = lambda: click_boton(0))

boton_borrar = Button(ventana, text ="AC", width = 5, height = 2 , command = lambda: borrar())

boton_paretesis1 = Button(ventana, text ="(", width = 5, height = 2 , command = lambda: click_boton("("))

boton_paretesis2 = Button(ventana, text =")", width = 5, height = 2 , command = lambda: click_boton(")"))

boton_punto = Button(ventana, text =".", width = 5, height = 2 , command = lambda: click_boton("."))

boton_div = Button(ventana, text ="/", width = 5, height = 2 , command = lambda: click_boton("/"))

boton_mult = Button(ventana, text ="x", width = 5, height = 2 , command = lambda: click_boton("*"))

boton_sum = Button(ventana, text ="+", width = 5, height = 2 , command = lambda: click_boton("+"))

boton_rest = Button(ventana, text ="-", width = 5, height = 2 , command = lambda: click_boton("-"))

boton_igual = Button(ventana, text ="=", width = 5, height = 2 , command = lambda: hacer_operacion())

#boton = Button(ventana, text ="", width = 5, height = 2 )

#Agregar botones en pantalla

boton_borrar.grid(row = 1, column = 0,padx = 5, pady = 5)

boton_paretesis1.grid(row = 1, column = 1,padx = 5, pady = 5)

boton_paretesis2.grid(row = 1, column = 2,padx = 5, pady = 5)

boton_div.grid(row = 1, column = 3,padx = 5, pady = 5)

boton7.grid(row = 2, column = 0,padx = 5, pady = 5)

boton8.grid(row = 2, column = 1,padx = 5, pady = 5)

boton9.grid(row = 2, column = 2,padx = 5, pady = 5)

boton_mult.grid(row = 2, column = 3,padx = 5, pady = 5)

boton4.grid(row = 3, column = 0,padx = 5, pady = 5)

boton5.grid(row = 3, column = 1,padx = 5, pady = 5)

boton6.grid(row = 3, column = 2,padx = 5, pady = 5)

boton_sum.grid(row = 3, column = 3,padx = 5, pady = 5)

boton1.grid(row = 4, column = 0,padx = 5, pady = 5)

boton2.grid(row = 4, column = 1,padx = 5, pady = 5)

boton3.grid(row = 4, column = 2,padx = 5, pady = 5)

boton_rest.grid(row = 4, column = 3, padx = 5, pady = 5)

boton0.grid(row = 5, column = 0, columnspan = 2, padx = 5, pady = 5)

boton_punto.grid(row = 5, column = 2,padx = 5, pady = 5)

boton_igual.grid(row = 5, column = 3, padx = 5, pady = 5)

ventana.mainloop()