code: def check_courses(self, kcdms):
          
          selected_courses = self.get_selected_courses()
          selected_kcdms = {course['课程代码'] for course in selected_courses}
          result = [True if kcdm in selected_kcdms else False for kcdm in kcdms]
          return result
docs: 检查课程是否被选
  
          @structure [bool]
  
          :param kcdms: 课程代码列表
          :return: 与课程代码列表长度一致的布尔值列表, 已为True,未选为False