code: def get_grade_entry_form_for_update(self, grade_entry_id):
          
          collection = JSONClientValidated('grading',
                                           collection='GradeEntry',
                                           runtime=self._runtime)
          if not isinstance(grade_entry_id, ABCId):
              raise errors.InvalidArgument('the argument is not a valid OSID Id')
          if (grade_entry_id.get_identifier_namespace() != 'grading.GradeEntry' or
                  grade_entry_id.get_authority() != self._authority):
              raise errors.InvalidArgument()
          result = collection.find_one({'_id': ObjectId(grade_entry_id.get_identifier())})
  
          obj_form = objects.GradeEntryForm(
              osid_object_map=result,
              effective_agent_id=str(self.get_effective_agent_id()),
              runtime=self._runtime,
              proxy=self._proxy)
          self._forms[obj_form.get_id().get_identifier()] = not UPDATED
  
          return obj_form
docs: Gets the grade entry form for updating an existing entry.
  
          A new grade entry form should be requested for each update
          transaction.
  
          arg:    grade_entry_id (osid.id.Id): the ``Id`` of the
                  ``GradeEntry``
          return: (osid.grading.GradeEntryForm) - the grade entry form
          raise:  NotFound - ``grade_entry_id`` is not found
          raise:  NullArgument - ``grade_entry_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*