code: def is_ready(self, service_name):
          
          service = self.get_service(service_name)
          reqs = service.get('required_data', [])
          return all(bool(req) for req in reqs)
docs: Determine if a registered service is ready, by checking its 'required_data'.
  
          A 'required_data' item can be any mapping type, and is considered ready
          if `bool(item)` evaluates as True.