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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get(context, request, username=None):
 """Plone users route """

    user_ids = []

    # Don't allow anonymous users to query a user other than themselves
    if api.is_anonymous():
        username = "current"

    # query all users if no username was given
    if username is None:
        user_ids = api.get_member_ids()
    elif username == "current":
        current_user = api.get_current_user()
        user_ids = [current_user.getId()]
    else:
        user_ids = [username]

    # Prepare batch
    size = req.get_batch_size()
    start = req.get_batch_start()
    batch = api.make_batch(user_ids, size, start)

    # get the user info for the user ids in the current batch
    users = map(get_user_info, batch.get_batch())

    return {
        "pagesize": batch.get_pagesize(),
        "next": batch.make_next_url(),
        "previous": batch.make_prev_url(),
        "page": batch.get_pagenumber(),
        "pages": batch.get_numpages(),
        "count": batch.get_sequence_length(),
        "items": users,
    }