[已解决]python自定义异常抛出

AIlaopo

def GetSumAndAvg(num = 10):
    sum = 0
    i = num
    while i:
        try :
            a = input("please input a integer: ")
            if isinstance(a,int) == False:
                raise NonIntegerError
        except NonIntegerError:
            print('Input number is not a integer!')
        else:
            sum += a
            i -= 1
    print('sum is %d , average is %d' %(sum,sum/num))
想实现检查输入的数是否是整数，不是整数就抛出异常           
这里自定义了一个 异常，运行的时候程序报错  说未定义，请问raise不能这样定义自己命名的异常吗？         
            
>>> GetSumAndAvg(5)
please input a integer: 3.3
Traceback (most recent call last):
  File "C:/python/MyProject/exercise7_2_1.py", line 8, in GetSumAndAvg
    raise NonIntegerError
NameError: name 'NonIntegerError' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<pyshell#25>", line 1, in <module>
    GetSumAndAvg(5)
  File "C:/python/MyProject/exercise7_2_1.py", line 9, in GetSumAndAvg
    except NonIntegerError:
NameError: name 'NonIntegerError' is not defined

最佳答案

月排行榜 / 总排行榜

冬雪雪冬

2018-4-3 14:47:29

需要写成这样：

1. def GetSumAndAvg(num = 10):
   
2.     sum = 0
   
3.     i = num
   
4.     while i:
   
5.         try :
   
6.             a = input("please input a integer: ")
   
7.             if isinstance(a,int) == False:
   
8.                 raise Exception('NonIntegerError')
   
9.         except Exception:
   
10.             print('Input number is not a integer!')
    
11.         else:
    
12.             sum += a
    
13.             i -= 1
    
14.     print('sum is %d , average is %d' %(sum,sum/num))

复制代码

跳转到最佳答案楼层

冬雪雪冬

需要写成这样：

1. def GetSumAndAvg(num = 10):
   
2.     sum = 0
   
3.     i = num
   
4.     while i:
   
5.         try :
   
6.             a = input("please input a integer: ")
   
7.             if isinstance(a,int) == False:
   
8.                 raise Exception('NonIntegerError')
   
9.         except Exception:
   
10.             print('Input number is not a integer!')
    
11.         else:
    
12.             sum += a
    
13.             i -= 1
    
14.     print('sum is %d , average is %d' %(sum,sum/num))

复制代码