code: def POST_AUTH(self):  # pylint: disable=arguments-differ
          
  
          username = self.user_manager.session_username()
          user_info = self.database.users.find_one({"username": username})
          user_input = web.input()
          success = None
  
          # Handle registration to a course
          if "register_courseid" in user_input and user_input["register_courseid"] != "":
              try:
                  course = self.course_factory.get_course(user_input["register_courseid"])
                  if not course.is_registration_possible(user_info):
                      success = False
                  else:
                      success = self.user_manager.course_register_user(course, username, user_input.get("register_password", None))
              except:
                  success = False
          elif "new_courseid" in user_input and self.user_manager.user_is_superadmin():
              try:
                  courseid = user_input["new_courseid"]
                  self.course_factory.create_course(courseid, {"name": courseid, "accessible": False})
                  success = True
              except:
                  success = False
  
          return self.show_page(success)
docs: Parse course registration or course creation and display the course list page