code: def _get_instances(self, page_number=None):
          
          instances = []
          uri = '/v2/spaces/%s/service_instances' % self.guid
          json_response = self.api.get(uri)
          instances += json_response['resources']
          while json_response['next_url'] is not None:
              json_response = self.api.get(json_response['next_url'])
              instances += json_response['resources']
  
          return instances
docs: Returns the service instances activated in this space.