def create_intervals(data: set):
    """
        Create a list of intervals out of set of ints.
    """
    if len(data) == 0:
        return []
    results = []
    data = sorted(data)
    start = None
    current_number = None
    for number in data:
        if start is None:
            start = number
            current_number = start
            continue
        if number != start and number != (current_number + 1):
            results.append((start, current_number))
            start = number
        current_number = number
    results.append((start, current_number))
    return results


if __name__ == '__main__':
    # These "asserts" using only for self-checking and not necessary for auto-testing
    assert create_intervals({1, 2, 3, 4, 5, 7, 8, 12}) == [(1, 5), (7, 8), (12, 12)], "First"
    assert create_intervals({1, 2, 3, 6, 7, 8, 4, 5}) == [(1, 8)], "Second"
    assert create_intervals({7, 9, 10, 11, 12}) == [(7, 7), (9, 12)], "Third"
    print('Almost done! The only thing left to do is to Check it!')