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  1. import contextlib
  2.  
  3. class Guard:
  4.     def __init__(self, name):
  5.         self.name = name
  6.  
  7.     def __enter__(self):
  8.         print('enter', self.name)
  9.         return self
  10.  
  11.     def __exit__(self, *exc):
  12.         print('exit', self.name)
  13.  
  14. class Foo(contextlib.ExitStack):
  15.     def __init__(self, name):
  16.         self.name = name
  17.         super().__init__()
  18.         super().__enter__()
  19.         self.g = self.enter_context(Guard(self.name))
  20.  
  21. with Foo('y') as y:
  22.     pass
  23.  
  24. z = Foo('z')
  25. z.close()
  26.  
Success #stdin #stdout 0.04s 9328KB
comments (?)
stdin
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Standard input is empty
stdout
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enter y
exit y
enter z
exit z
https://ideone.com/Y6QNzm
language:
Python 3 (python  3.9.5)
created:
5 years ago
visibility:
public

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