Get the UID of the post author.

    :param Post post: The post object to determine authorship of
    :return: Author UID
    :rtype: str

def _author_uid_get(post):
    """Get the UID of the post author.

    :param Post post: The post object to determine authorship of
    :return: Author UID
    :rtype: str
    """
    u = post.meta('author.uid')
    return u if u else str(current_user.uid)