code: def set_stylesheet(self, subreddit, stylesheet):
          
          subreddit = six.text_type(subreddit)
          data = {'r': subreddit,
                  'stylesheet_contents': stylesheet,
                  'op': 'save'}  # Options: save / preview
          self.evict(self.config['stylesheet'].format(subreddit=subreddit))
          return self.request_json(self.config['subreddit_css'], data=data)
docs: Set stylesheet for the given subreddit.
  
          :returns: The json response from the server.