UnboundLocalError:在assignmen之前引用了局部变量“mp”

Question

我在测试时得到这个错误：

Please enter the customer's name: 1
Please enter the customer's Phone Number:01506890639
Please enter the size of group: 4
Please enter the rating of the meal: 3
Do you wish to continue: Y/N?n


The largest group that visited had a cohort of:4
Traceback (most recent call last):
  File "E:/CWtsk/code2.1.py", line 93, in <module>
    main()
  File "E:/CWtsk/code2.1.py", line 12, in main
    mealrating(score)
  File "E:/CWtsk/code2.1.py", line 67, in mealrating
    mp = mp + 1
UnboundLocalError: local variable 'mp' referenced before assignment

我不确定引用的内容，因为正如您在我的代码中看到的，它以前没有被引用过。在

^{pr2}$

我不知道这是什么。虽然我需要调整最后一个功能，因为我忘记了它的故障排除。在

Answer 1

您还没有定义mp，但已经在赋值的右侧使用了它。这将引发错误。通过以下方式轻松解决：

mp = 0 # <- Add this line and change the 0 if you expect something different
if score[x] >= 1 and score[x] <= 3:
        mp = mp + 1