from Tkinter import *
EAN = raw_input(" Introduzca número: ")
def eanCheck():
    checksum = 0 for i, digit in enumerate(reversed(ean)):
    checksum += int(digit) * 3
    if (i % 2 == 0):
    else
        int(digit) :
    return (10 - (checksum % 10)) % 10
    print "Digito de control: %d" %eanCheck(EAN)
root= Tk()
root.title("Calculo digito de control")