code: def _log_submission(submission, student_item):
      
      logger.info(
          u"Created submission uuid={submission_uuid} for "
          u"(course_id={course_id}, item_id={item_id}, "
          u"anonymous_student_id={anonymous_student_id})"
          .format(
              submission_uuid=submission["uuid"],
              course_id=student_item["course_id"],
              item_id=student_item["item_id"],
              anonymous_student_id=student_item["student_id"]
          )
      )
docs: Log the creation of a submission.
  
      Args:
          submission (dict): The serialized submission model.
          student_item (dict): The serialized student item model.
  
      Returns:
          None