code: def get_student_current_grade(self, username, course_id):
          
          # the request is done in behalf of the current logged in user
          resp = self.requester.get(
              urljoin(
                  self.base_url,
                  '/api/grades/v1/courses/{course_key}/?username={username}'.format(
                      username=username,
                      course_key=course_id
                  )
              )
          )
  
          resp.raise_for_status()
  
          return CurrentGrade(resp.json()[0])
docs: Returns an CurrentGrade object for the user in a course
  
          Args:
              username (str): an edx user's username
              course_id (str): an edX course id.
  
          Returns:
              CurrentGrade: object representing the student current grade for a course