def get_min_max(arr):
    """
    Return a tuple(min, max) out of list of unsorted integers.

    Args:
       arr(list): list of integers containing one or more integers
    Returns:
        (int, int): A tuple of min and max numbers.
    """
    if len(arr) == 0:
        return None, None
    min_number = max_number = arr[0]
    for number in arr:
        if number < min_number:
            min_number = number
        if number > max_number:
            max_number = number
    return min_number, max_number