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  1. class t(str):
  2.  
  3.     def __len__(self):
  4.         return 0
  5.  
  6.  
  7. t = t('123')
  8. if t:
  9.     print('y')
  10. else:
  11.     print('n')
  12.  
  13. print(t)
Success #stdin #stdout 0.02s 9984KB
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stdin
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Standard input is empty
stdout
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n
123
https://ideone.com/5h9yw6
language:
Python 3 (python  3.9.5)
created:
8 years ago
visibility:
public

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