projecteuler:2

0x02.py

"""
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, ...

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


def fibSeries(a: int, b: int) -> int:
    ret = []
    M = 53
    for i in range(0, M):
        a, b = b, a + b
        if a % 2 == 0 and sum(ret) < 4000000:
            ret.append(a)

    return sum(ret)


print("Fibonacci answer = {}".format(fibSeries(0, 1)))