divisible_by_eight.py

def subsequences(number):
    "Generator for digit subsequences of an integer number"

    number = str(number)
    number_length = len(number)

    for start in range(0, number_length):
        for end in range(start + 1, number_length + 1):

            yield int(number[start:end])


def subsequences_divisible_by_eight(number):
    "Generator yielding only subsequences of number divisible by 8"

    yield from (_ for _ in subsequences(number) if _ % 8 == 0)


print(list(subsequences_divisible_by_eight(1234567890)))