code: def get_grade(self):
          
          grade_system = self.get_gradebook_column().get_grade_system()
  
          for grade in grade_system.get_grades():
              if str(grade.ident) == self._my_map['gradeId']:
                  return grade
          raise errors.IllegalState('gradeId does not exist in this GradeSystem')
docs: Gets the grade in this entry if the grading system is based on grades.
  
          return: (osid.grading.Grade) - the grade
          raise:  IllegalState - ``is_graded()`` is ``false`` or
                  ``GradeSystem.isBasedOnGrades()`` is ``false``
          raise:  OperationFailed - unable to complete request
          *compliance: mandatory -- This method must be implemented.*