class Pila(object):
    "ejercicio 3-2"
    
    def __init__(self, *args):
        self.base = []
        for arg in args:
            self.base.append(arg)

    def len(self):
        return len(self.base)

    def top(self):
        indice = self.len() - 1
        return self.base[indice]

    def push(self, args):
        self.base.append(args)

    def pop(self):
        try:
            return self.base.pop()
        except IndexError:
            return "Fuera del indice/vacío"

    def is_empty(self):
        return (lambda x: True if x == 0 else False)(len(self.base))


miPila = Pila('uno', 'dos', 'tres', 'cuatro')

print("Mi Pila1 :", miPila.base, '\n')

print("Pila1 top() :", miPila.top(), '\n')

print("Pila1 post - push('dieciseis') :", end='')
miPila.push('dieciseis')
print(miPila.base, '\n')

print("Pila1 pop() :", miPila.pop(), '\n')

print("Largo Pila1 :", miPila.len(), '\n')

print("Esta la Pila1 vacía ? :", miPila.is_empty(), '\n')

miPila2 = Pila()
print("Esta vacía la Pila2 ? :", miPila2.is_empty(),'\n')
print("Pila2 pop() : ", miPila2.pop())