def double_stuff (things) :
    """ Returns a new list with doubl ethe values than the previous list """

    # accum list
    new_list = []

    # iterate over each item in the prev list
    for thing in things :
        # double each item
        new_elem = thing * 2
        # add to the new list
        new_list.append(new_elem)
    return new_list