print "Do you want to be (A) begginner, (B) interidate or (Other) advanced?"if level == "A":elif level == "B":else :这将显示以下错误: File "C:/Users/*****/Maths.py", line 4, in <module>
i
我在MongoDB中使用Springboot,我有一个类似这样的类: @DBRef public List<Question> questions; // Here I want a List<QuestionAnswers> questions instead, without DBRef我怎么能做这样的事情,这可能吗?或者我应该在不扩展Mcq的情况下重新声明McqInstance?