code: def get_bundle_imported_services(self, bundle):
          
          with self.__svc_lock:
              return sorted(self.__bundle_imports.get(bundle, []))
docs: Returns this bundle's ServiceReference list for all services it is
          using or returns None if this bundle is not using any services.
          A bundle is considered to be using a service if its use count for that
          service is greater than zero.
  
          The list is valid at the time of the call to this method, however, as
          the Framework is a very dynamic environment, services can be modified
          or unregistered at any time.
  
          :param bundle: The bundle to look into
          :return: The references of the services used by this bundle