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  1. class A:
  2.     def __init__(self,n):
  3.         self.n=n
  4.     def __str__(self):
  5.         return f'A[{self.n}]'
  6.  
  7.  
  8.  
  9. print("====== 1 ======")
  10.  
  11. F=[]
  12.  
  13. a1=A(13)
  14. def f():
  15.     print(a1)
  16. F.append(f)
  17.  
  18. a2=A(17)
  19. def f():
  20.     print(a2)
  21. F.append(f)
  22.  
  23. for f in F:
  24.     f()
  25.  
  26. print("====== 2 ======")
  27.  
  28. F=[]
  29.  
  30. a=A(13)
  31. def f():
  32.     print(a)
  33. F.append(f)
  34.  
  35. a=A(17)
  36. def f():
  37.     print(a)
  38. F.append(f)
  39.  
  40. for f in F:
  41.     f()
  42.  
  43. print("====== 2.1 ======")
  44.  
  45. F=[]
  46.  
  47. a=A(13)
  48. def f(*,a=a):
  49.     print(a)
  50. F.append(f)
  51.  
  52. a=A(17)
  53. def f(*,a=a):
  54.     print(a)
  55. F.append(f)
  56.  
  57. for f in F:
  58.     f()
  59.  
  60. print("====== 3 ======")
  61.  
  62. F=[]
  63.  
  64. a=A(13)
  65. def f():
  66.     print(a)
  67. F.append(f)
  68. del a
  69.  
  70. for f in F:
  71.     f()
  72.  
Runtime error #stdin #stdout #stderr 0.18s 23532KB
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stdin
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Standard input is empty
stdout
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====== 1 ======
A[13]
A[17]
====== 2 ======
A[17]
A[17]
====== 2.1 ======
A[13]
A[17]
====== 3 ======
stderr
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Traceback (most recent call last):
  File "./prog.py", line 71, in <module>
  File "./prog.py", line 66, in f
NameError: name 'a' is not defined
https://ideone.com/0k8Vqa
language:
Python 3 (python  3.9.5)
created:
3 years ago
visibility:
public

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