def fn():
    n = 0

    def fn_closure():
        print('n = {}'.format(n))

    def obtener_n():
        return n

    def establecer_n(valor):
        nonlocal n
        n = valor

    fn_closure.obtener_n = obtener_n
    fn_closure.establecer_n = establecer_n

    return fn_closure


f = fn()
f()
f.establecer_n(10)
f()
n = f.obtener_n()
print(n)