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  1. class A:
  2. 	def __init__(self):
  3. 		self.checked = False
  4.  
  5. 	def __bool__(self):
  6. 		if self.checked:
  7. 			return False
  8. 		else:
  9. 			self.checked = True
  10. 			return True
  11.  
  12. a = A()
  13.  
  14. while a:
  15. 	print('hello, world!')
Success #stdin #stdout 0.03s 9440KB
comments (?)
stdin 
Standard input is empty
stdout 
hello, world!
https://ideone.com/5tas6p
language:
Python 3 (python  3.9.5)
created:
9 years ago
visibility:
public

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