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  1. import pickle
  2.  
  3. class ThingHolder:
  4.     def __init__(self, thing):
  5.         print(self, thing)
  6.         self.thing = thing
  7.     def __reduce__(self):
  8.         return (ThingHolder, (self.thing,))
  9.  
  10. th = ThingHolder([])
  11. th.thing.append(th)
  12.  
  13. th2 = pickle.loads(pickle.dumps(th, pickle.HIGHEST_PROTOCOL))
  14.  
  15. print()
  16. print(th2, th2.thing)
Success #stdin #stdout 0.05s 9920KB
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stdin
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Standard input is empty
stdout
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<__main__.ThingHolder object at 0x2addfdafee80> []
<__main__.ThingHolder object at 0x2addfdafeeb8> []
<__main__.ThingHolder object at 0x2addfdafeef0> [<__main__.ThingHolder object at 0x2addfdafeeb8>]

<__main__.ThingHolder object at 0x2addfdafeeb8> [<__main__.ThingHolder object at 0x2addfdafeeb8>]
https://ideone.com/DI7XMN
language:
Python 3 (python  3.12)
created:
7 years ago
visibility:
public

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