How to fix python error

Уже минут 30 мучаюсь, несколько раз переписал код по разному =(

row_phibona4i = [1,2,3]

i = 2

while row_phibona4i[i] < 4000000:
row_phibona4i.append(row_phibona4i[-1]+row_phibona4i[-2])

i+=1

array = []

for x in len(row_phibona4i):
if row_phibona4i[x] % 2 == 0:
array.append(row_phibona4i[x])

print(sum(array))

Code

row_phibona4i = [1,2,3]



i = 2



while row_phibona4i[i] < 4000000:

    row_phibona4i.append(row_phibona4i[-1]+row_phibona4i[-2])



    i+=1



array = []



for x in len(row_phibona4i):

    if row_phibona4i[x] % 2 == 0:

        array.append(row_phibona4i[x])



print(sum(array))

Ошибка:
File "task2.py", line 12, in <module>
for x in len(row_phibona4i):
TypeError: 'int' object is not iterable