fib.py

def fib(n):
    sequence = [1, 1]
    next_number = 2
    while next_number <= n:
        sequence.append(next_number)
        next_number = sequence[len(sequence) - 1] + sequence[len(sequence) - 2]
    return sequence

def get_evens(l):
    ret = []
    for i in l:
        if i % 2 == 0:
            ret.append(i)
    return ret

def sum_list(l):
    total = 0
    for i in l:
        total += i
    return total

print(sum_list(get_evens(fib(4000000))))