def read_user_documents_for_single_user_generator(user_twitter_id, mongo_database):
    """
    Stores Twitter list objects that a Twitter user is a member of in different mongo collections.

    Inputs: - user_twitter_id: A Twitter user id.
            - mongo_database: A mongo database.

    Yields: - twitter_list: A tuple containing: * A Twitter user id.
                                                * A python list containing Twitter lists in dictionary (json) format.
    """
    collection_name = str(user_twitter_id)
    collection = mongo_database[collection_name]
    cursor = collection.find()

    for twitter_list in cursor:
        yield twitter_list