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