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  1. class A:
  2.  
  3.     def __enter__(self):
  4.         print('entered')
  5.         return self
  6.  
  7.     def __exit__(self, *exc_info):
  8.         self.attr = 'reset'
  9.         print('exited')
  10.  
  11.  
  12. def f():
  13.     with A() as instance:
  14.         instance.attr = 'set'
  15.         print('attribute set')
  16.         return instance
  17.  
  18.  
  19. # Will this always be True?
  20. print(f().attr == 'reset')
Success #stdin #stdout 0.02s 8736KB
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stdin
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Standard input is empty
stdout
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entered
attribute set
exited
True
https://ideone.com/Z736NM
language:
Python 3 (python  3.9.5)
created:
9 years ago
visibility:
public

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