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  1. class PrevCurr:
  2.     def __init__(self, obj_initial):
  3.         self.previous = obj_initial
  4.         self.current = obj_initial
  5.     def update(self, new):
  6.         self.previous = self.current
  7.         self.current = new
  8.  
  9. obj = [1]
  10. pc = PrevCurr(obj)
  11. obj.append(2)
  12. pc.update(obj)
  13.  
  14. print(pc.previous, pc.current)
Success #stdin #stdout 0.02s 9208KB
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Standard input is empty
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[1, 2] [1, 2]
https://ideone.com/j1GGPG
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
public

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