code: def get_authorization_vault_assignment_session(self):
          
          if not self.supports_authorization_vault_assignment():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.AuthorizationVaultAssignmentSession(runtime=self._runtime)
docs: Gets the session for assigning authorizations to vault mappings.
  
          return: (osid.authorization.AuthorizationVaultAssignmentSession)
                  - a ``AuthorizationVaultAssignmentSession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented -
                  ``supports_authorization_vault_assignment()`` is
                  ``false``
          *compliance: optional -- This method must be implemented if
          ``supports_authorization_vault_assignment()`` is ``true``.*