# checks for an integer more than 0 (allows <enter>)
def int_check(question, valid_ans):

    while True:

        # Get user response and make sure it's lowercase
        user_response = input(question).lower()

        for item in valid_ans:
            # check if the user response is a word in the list
            if item == user_response:
                return item

            # check if the user response is the same as
            # the first letter of an itm in the list
            elif user_response == item[0]:
                return item

            return "invalid"


# Automatated testing is below in the form (test_case, expected_value)
to_test = [
    ('xlii', 'invalid'),
    ('0.5', 'invalid'),
    ('0', 'invalid'),
    (1, 1),
    (2, 2),
    ('', "infinite"),
]

# run test!
for item in to_test:
    # retreive test case and expected value
    case = item[0]
    expected = item[1]