code: def available_backend_simulators(self, access_token=None, user_id=None):
          
          if access_token:
              self.req.credential.set_token(access_token)
          if user_id:
              self.req.credential.set_user_id(user_id)
          if not self.check_credentials():
              raise CredentialsError('credentials invalid')
          else:
              ret = self.req.get('/Backends')
              if (ret is not None) and (isinstance(ret, dict)):
                  return []
              return [backend for backend in ret
                      if backend.get('status') == 'on' and
                      backend.get('simulator') is True]
docs: Get the backend simulators available to use in the QX Platform