docs: def get_objective_bank_admin_session(self, proxy):
          """Gets the OsidSession associated with the objective bank administration service.
  
          arg:    proxy (osid.proxy.Proxy): a proxy
          return: (osid.learning.ObjectiveBankAdminSession) - an
                  ``ObjectiveBankAdminSession``
          raise:  NullArgument - ``proxy`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - ``supports_objective_bank_admin() is
                  false``
          *compliance: optional -- This method must be implemented if
          ``supports_objective_bank_admin()`` is true.*
  
          """
          if not self.supports_objective_bank_admin():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.ObjectiveBankAdminSession(proxy=proxy, runtime=self._runtime)