def enumerate_items(items):
    """
    list items in a string
    ex. ["dog", "cat", "mouse"] returns "dog, cat, and mouse"
    """
    items_str = ""
    # multiple items in container
    if len(items) > 1:
        for item in items[:-2]:
            items_str += "{}, ".format(item)

        items_str += "{} ".format(items[-2])
        items_str += "and {}".format(items[-1])
    # one item
    elif len(items) == 1:
        items_str += items[0]
    
    return items_str