def find_zero(test_array):
    if type(test_array) != list:
        print "Input is not a list."
        exit()
    found_zero = False
    for number in test_array:
        for number2 in test_array:
            for number3 in test_array:
                if number + number2 + number3 == 0:
                    found_zero = True

    if found_zero:
        return True
    else:
        return False


print find_zero([1, 2, 3, 5, 10, -100, -50, -8])  # True
print find_zero([1, 2, 3, 5, 10, -100, -50, -25])  # False