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  1. from functools import lru_cache
  2.  
  3. def hashifying_lru_cache(
  4.         func_or_None=None, maxsize=128, typed=False, hasher=id):
  5.     def decorator(func):
  6.         class Hashified:
  7.             def __init__(self, obj):
  8.                 self.obj = obj
  9.             def __eq__(self, other):
  10.                 return hasher(self.obj) == hasher(other.obj)
  11.             def __hash__(self):
  12.                 return hasher(self.obj)
  13.         def unwrapper(*args, **kwargs):
  14.             return func(
  15.                 *(arg.obj if isinstance(arg, Hashified) else arg
  16.                     for arg in args),
  17.                 **{name: value.obj if isinstance(value, Hashified) else value
  18.                     for name, value in kwargs.items()}
  19.             )
  20.         def wrapper(*args, **kwargs):
  21.             return decorated(
  22.                 *(Hashified(arg) if arg.__hash__ is None else arg
  23.                     for arg in args),
  24.                 **{name: Hashified(value) if value.__hash__ is None else value
  25.                     for name, value in kwargs.items()}
  26.             )
  27.         decorated = lru_cache(maxsize=maxsize, typed=typed)(unwrapper)
  28.         return wrapper
  29.     return decorator if func_or_None is None else decorator(func_or_None)
  30.  
  31. @hashifying_lru_cache
  32. def sum_list(const_list):
  33.     print('got', const_list)
  34.     return sum(const_list)
  35.  
  36. lst = [1, 2, 3]
  37. print(sum_list(lst))
  38. print(sum_list(lst))
Success #stdin #stdout 0.07s 14024KB
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Standard input is empty
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got [1, 2, 3]
6
6
https://ideone.com/jIbybZ
language:
Python 3 (python  3.12)
created:
38 days ago
visibility:
secret

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