code: def get_bundle_by_id(self, bundle_id):
          # type: (int) -> Union[Bundle, Framework]
          
          if bundle_id == 0:
              # "System bundle"
              return self
  
          with self.__bundles_lock:
              if bundle_id not in self.__bundles:
                  raise BundleException("Invalid bundle ID {0}".format(bundle_id))
  
              return self.__bundles[bundle_id]
docs: Retrieves the bundle with the given ID
  
          :param bundle_id: ID of an installed bundle
          :return: The requested bundle
          :raise BundleException: The ID is invalid