code: def get_vault_lookup_session(self):
          
          if not self.supports_vault_lookup():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.VaultLookupSession(runtime=self._runtime)
docs: Gets the OsidSession associated with the vault lookup service.
  
          return: (osid.authorization.VaultLookupSession) - a
                  ``VaultLookupSession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - ``supports_vault_lookup() is false``
          *compliance: optional -- This method must be implemented if
          ``supports_vault_lookup()`` is true.*