code: def set_flair(self, subreddit, item, flair_text='', flair_css_class=''):
          
          data = {'r': six.text_type(subreddit),
                  'text': flair_text or '',
                  'css_class': flair_css_class or ''}
          if isinstance(item, objects.Submission):
              data['link'] = item.fullname
              evict = item.permalink
          else:
              data['name'] = six.text_type(item)
              evict = self.config['flairlist'].format(
                  subreddit=six.text_type(subreddit))
          response = self.request_json(self.config['flair'], data=data)
          self.evict(evict)
          return response
docs: Set flair for the user in the given subreddit.
  
          `item` can be a string, Redditor object, or Submission object.
          If `item` is a string it will be treated as the name of a Redditor.
  
          This method can only be called by a subreddit moderator with flair
          permissions. To set flair on yourself or your own links use
          :meth:`~praw.__init__.AuthenticatedReddit.select_flair`.
  
          :returns: The json response from the server.