def create_user_lookup(users_json):
    """Create a dictionary containing user profiles keyed to Canvas user ID.log_status.
    We'll need this lookup user names for submission commenters.
    users_json -- JSON collection of user profiles, as returned by load_users_json().
    Returns dictionary.

    """
    lookup_dict = {}
    for user in users_json:
        lookup_dict[user['id']] = user
    return lookup_dict