Even Fibonacci Numbers

Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with $1$ and $2$ , the first $10$ terms will be:

$1, 2, 3, 5, 8, 13, 21, 34, 55, 89, \dots$

By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

El calculo de los numeros de fibonacci se puede hacer fácilmente con python, usando un array y añadiendo $n$ terminos:

$f_{0} = 1$ , $f_{1} = 1$ , entonces $f_{n} = f_{n - 1} + f_{n - 2}$

def fibo(n):
    numbers = [1, 1]
    while True:
        new = numbers[-1]+numbers[-2]
        if new<n:
            numbers.append(new)
        else:
            break
    return numbers

sum([x for x in fibo(4000000) if x%2==0])