code: def friend(self, note=None, _unfriend=False):
          
          self.reddit_session.evict(self.reddit_session.config['friends'])
  
          # Requests through password auth use /api/friend
          # Requests through oauth use /api/v1/me/friends/{username}
          if not self.reddit_session.is_oauth_session():
              modifier = _modify_relationship('friend', unlink=_unfriend)
              data = {'note': note} if note else {}
              return modifier(self.reddit_session.user, self, **data)
  
          url = self.reddit_session.config['friend_v1'].format(user=self.name)
          # This endpoint wants the data to be a string instead of an actual
          # dictionary, although it is not required to have any content for adds.
          # Unfriending does require the 'id' key.
          if _unfriend:
              data = {'id': self.name}
          else:
              # We cannot send a null or empty note string.
              data = {'note': note} if note else {}
          data = dumps(data)
          method = 'DELETE' if _unfriend else 'PUT'
          return self.reddit_session.request_json(url, data=data, method=method)
docs: Friend the user.
  
          :param note: A personal note about the user. Requires reddit Gold.
          :param _unfriend: Unfriend the user. Please use :meth:`unfriend`
              instead of setting this parameter manually.
  
          :returns: The json response from the server.