def last_post(self):
        """ Returns the latest post associated with the node or one of its descendants. """
        posts = [n.last_post for n in self.children if n.last_post is not None]
        children_last_post = max(posts, key=lambda p: p.created) if posts else None
        if children_last_post and self.obj.last_post_id:
            return max(self.obj.last_post, children_last_post, key=lambda p: p.created)
        return children_last_post or self.obj.last_post
def last_post ( self ) : posts = [ n . last_post for n in self . children if n . last_post is not None ] children_last_post = max ( posts , key = lambda p : p . created ) if posts else None if children_last_post and self . obj . last_post_id : return max ( self . obj . last_post , children_last_post , key = lambda p : p . created ) return children_last_post or self . obj . last_post
Returns the latest post associated with the node or one of its descendants.