def count_even_digits_spyr03_for(n, n_digits=None):
    count = 0
    for c in str(n):
        if c in "02468":
            count += 1
    return count

def count_even_digits_spyr03_sum(n, n_digits=None):
    return sum(c in "02468" for c in str(n))

def count_even_digits_spyr03_list(n, n_digits=None):
    return [c in "02468" for c in str(n)].count(True)