def generate_comments(reddit, submission_id):
    """
    Take a PRAW reddit object and finds comments for a given
    submissions_id

    Parameters
    ----------
    reddit: praw.Reddit
        A PRAW Reddit API instance
    submission_id: int
        The id of the subreddit submission whose comments we want

    Returns
    -------
    submission.comments: praw.models.comment_forest.CommentForest
        A Reddit CommentForest that can be iterated through
    """

    # get submission from praw via submission_id from psaw
    submission = reddit.submission(id=submission_id)

    # should load all folded comments
    return submission.comments