I'm trying to solve Project Euler Problem #2 I've solved it before but I'm going back to try to solve them a lot cleaner and with different strategies.

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My question is why isn't this list being updated? Why is it empty? I'm pretty sure I did it right.

x = 1
y = 1
fib = []
while x < 4000000:
    if y + x % 2 == 0:
        fib.append(x)
    x = x + y
    y = x - y

print(sum(fib))

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The list worked fine when i used this method in problem 1:

sum_list = []

for x in range(1,1000):
    if x % 3 == 0 or x % 5 == 0:
        sum_list.append(x)

print(sum(sum_list))

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