code: def default_region(fname):
      
      manager = _get_storage_manager(fname)
      if hasattr(manager, "get_region"):
          return manager.get_region()
  
      raise NotImplementedError("Unexpected object store %s" % fname)
docs: Return the default region for the received resource.
  
      Note:
          This feature is available only for AmazonS3 storage manager.