def make_list(item_or_items):
    """
    Makes a list out of the given items.
    Examples:
        >>> make_list(1)
        [1]
        >>> make_list('str')
        ['str']
        >>> make_list(('i', 'am', 'a', 'tuple'))
        ['i', 'am', 'a', 'tuple']
        >>> print(make_list(None))
        None
        >>> # An instance of lists is unchanged
        >>> l = ['i', 'am', 'a', 'list']
        >>> l_res = make_list(l)
        >>> l_res
        ['i', 'am', 'a', 'list']
        >>> l_res is l
        True

    Args:
        item_or_items: A single value or an iterable.
    Returns:
        Returns the given argument as an list.
    """
    if item_or_items is None:
        return None
    if isinstance(item_or_items, list):
        return item_or_items
    if hasattr(item_or_items, '__iter__') and not isinstance(item_or_items, str):
        return list(item_or_items)
    return [item_or_items]