code: def get_asset(self, asset_id=None):
          
          return Asset(self._provider_session.get_asset(asset_id), self._config_map)
docs: Gets the ``Asset`` specified by its ``Id``.
  
          In plenary mode, the exact ``Id`` is found or a ``NotFound``
          results. Otherwise, the returned ``Asset`` may have a different
          ``Id`` than requested, such as the case where a duplicate ``Id``
          was assigned to an ``Asset`` and retained for compatibility.
  
          arg:    asset_id (osid.id.Id): the ``Id`` of the ``Asset`` to
                  retrieve
          return: (osid.repository.Asset) - the returned ``Asset``
          raise:  NotFound - no ``Asset`` found with the given ``Id``
          raise:  NullArgument - ``asset_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*