code: def demo_login(self, auth=None, url=None):
          
          self._rpc_api = PiazzaRPC()
          self._rpc_api.demo_login(auth=auth, url=url)
docs: Authenticate with a "Share Your Class" URL using a demo user.
  
          You may provide either the entire ``url`` or simply the ``auth``
          parameter.
  
          :param url: Example - "https://piazza.com/demo_login?nid=hbj11a1gcvl1s6&auth=06c111b"
          :param auth: Example - "06c111b"