docs: def flair(self, r, name, text, css_class):
          """Login required.  Sets flair for a user.  See https://github.com/reddit/reddit/wiki/API%3A-flair.  Returns True or raises :class:`exceptions.UnexpectedResponse` if non-"truthy" value in response.
          
          URL: ``http://www.reddit.com/api/flair``
          
          :param r: name of subreddit
          :param name: name of the user
          :param text: flair text to assign
          :param css_class: CSS class to assign to flair text
          """
          data = dict(r=r, name=name, text=text, css_class=css_class)
          j = self.post('api', 'flair', data=data)
          return assert_truthy(j)