[已解决]装饰器流程判断

Mefine

现有代码如下

1. @fun_d(minNum=10,maxNum=20)
   
2. def fun1(a,b):
   
3.     return a+b
   
4. 
   
5. @fun_d(minNum=10,maxNum=20)
   
6. def fun2(a,b,c):
   
7.     return a+b-c

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要求实现 fun_d 装饰器,要求:
确保使用该装饰器的方法参数都是int类型,否则抛出异常
(提示可以使用 isinstance(i,int) 判断i是否是int 类型)

参数的值在minNum 和 maxNum之间
如果参数值不符合,抛出异常

最佳答案

月排行榜 / 总排行榜

tommyyu

2022-11-22 10:57:43

1. def fun_d(minNum, maxNum):
   
2.     def outer(func):
   
3.         nonlocal minNum, maxNum
   
4.         def inner(*args):
   
5.             nonlocal minNum, maxNum, func
   
6.             for i in args:
   
7.                 assert isinstance(i, int)
   
8.                 assert minNum <= i <= maxNum
   
9.             return func(*args)
   
10.         return inner
    
11.     return outer
    
12. 
    
13. @fun_d(minNum=10,maxNum=20)
    
14. def fun1(a,b):
    
15.     return a+b
    
16. 
    
17. fun1(10, 20)
    
18. 30
    
19. fun1(1, 2)
    
20. Traceback (most recent call last):
    
21.   File "<pyshell#33>", line 1, in <module>
    
22.     fun1(1, 2)
    
23.   File "<pyshell#29>", line 8, in inner
    
24.     assert minNum <= i <= maxNum
    
25. AssertionError
    
26. fun1('1', '2')
    
27. Traceback (most recent call last):
    
28.   File "<pyshell#34>", line 1, in <module>
    
29.     fun1('1', '2')
    
30.   File "<pyshell#29>", line 7, in inner
    
31.     assert isinstance(i, int)
    
32. AssertionError
    
33. @fun_d(minNum=10,maxNum=20)
    
34. def fun2(a,b,c):
    
35.     return a+b-c
    
36. 
    
37. fun2(1, 2, 3)
    
38. Traceback (most recent call last):
    
39.   File "<pyshell#37>", line 1, in <module>
    
40.     fun2(1, 2, 3)
    
41.   File "<pyshell#29>", line 8, in inner
    
42.     assert minNum <= i <= maxNum
    
43. AssertionError
    
44. fun2('1', '2', '3')
    
45. Traceback (most recent call last):
    
46.   File "<pyshell#38>", line 1, in <module>
    
47.     fun2('1', '2', '3')
    
48.   File "<pyshell#29>", line 7, in inner
    
49.     assert isinstance(i, int)
    
50. AssertionError
    
51. fun2(10, 15, 20)
    
52. 5
    

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跳转到最佳答案楼层

tommyyu

1. def fun_d(minNum, maxNum):
   
2.     def outer(func):
   
3.         nonlocal minNum, maxNum
   
4.         def inner(*args):
   
5.             nonlocal minNum, maxNum, func
   
6.             for i in args:
   
7.                 assert isinstance(i, int)
   
8.                 assert minNum <= i <= maxNum
   
9.             return func(*args)
   
10.         return inner
    
11.     return outer
    
12. 
    
13. @fun_d(minNum=10,maxNum=20)
    
14. def fun1(a,b):
    
15.     return a+b
    
16. 
    
17. fun1(10, 20)
    
18. 30
    
19. fun1(1, 2)
    
20. Traceback (most recent call last):
    
21.   File "<pyshell#33>", line 1, in <module>
    
22.     fun1(1, 2)
    
23.   File "<pyshell#29>", line 8, in inner
    
24.     assert minNum <= i <= maxNum
    
25. AssertionError
    
26. fun1('1', '2')
    
27. Traceback (most recent call last):
    
28.   File "<pyshell#34>", line 1, in <module>
    
29.     fun1('1', '2')
    
30.   File "<pyshell#29>", line 7, in inner
    
31.     assert isinstance(i, int)
    
32. AssertionError
    
33. @fun_d(minNum=10,maxNum=20)
    
34. def fun2(a,b,c):
    
35.     return a+b-c
    
36. 
    
37. fun2(1, 2, 3)
    
38. Traceback (most recent call last):
    
39.   File "<pyshell#37>", line 1, in <module>
    
40.     fun2(1, 2, 3)
    
41.   File "<pyshell#29>", line 8, in inner
    
42.     assert minNum <= i <= maxNum
    
43. AssertionError
    
44. fun2('1', '2', '3')
    
45. Traceback (most recent call last):
    
46.   File "<pyshell#38>", line 1, in <module>
    
47.     fun2('1', '2', '3')
    
48.   File "<pyshell#29>", line 7, in inner
    
49.     assert isinstance(i, int)
    
50. AssertionError
    
51. fun2(10, 15, 20)
    
52. 5
    

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Mefine

1. def fun_d(minNum, maxNum):
   
2.     def outer(func):
   
3.         nonlocal minNum, maxNum
   
4.         def inner(*args):
   
5.             nonlocal minNum, maxNum, func
   
6.             for i in args:
   
7.                 assert isinstance(i, int)
   
8.                 assert minNum <= i <= maxNum
   
9.             return func(*args)
   
10.         return inner
    
11.     return outer
    
12. 
    
13. @fun_d(minNum=10,maxNum=20)
    
14. def fun1(a,b):
    
15.     return a+b
    
16. 
    
17. @fun_d(minNum=10,maxNum=20)
    
18. def fun2(a,b,c):
    
19.     return a+b-c
    
20. 
    
21. f = fun1(10,20),fun2(10,20,15)

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jackz007

1. def fun_d(minNum = 10 , maxNum = 20):
   
2.     def outer(func):
   
3.         def inner(* args):
   
4.             for x in args :
   
5.                 if not type(x) == int or x < minNum or x > maxNum :
   
6.                     return str(args) + ' : parameter type or value error.'
   
7.             else :
   
8.                 return func(* args)
   
9.         return inner
   
10.     return outer
    
11. 
    
12. @fun_d(10 , 20)
    
13. def fun1(a,b):
    
14.     return a+b
    
15. 
    
16. @fun_d(10 , 20)
    
17. def fun2(a,b,c):
    
18.     return a+b-c
    
19. 
    
20. print(fun1(15 , 16))               # 合格
    
21. print(fun1(3 , 15))                # 不合格
    
22. print(fun2(12 , 13 , 15))          # 合格
    
23. print(fun2(2 , 3 , 5))             # 不合格
    
24. print(fun1('abc' , 123))           # 不合格
    
25. print(fun2('abc' , 'bcd' , 123))   # 不合格

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Mefine

jackz007 发表于 2022-11-22 11:57

看起来确实更简洁一些，手动最佳~