[issue21145] Add the @cached_property decorator

[Antoine Pitrou]

Antoine Pitrou added the comment:

Does this work for you?

>>> class X:
...   @property
...   @functools.lru_cache(None)
...   def get_x(self):
...     print("computing")
...     return 5
... 
>>> x = X()
>>> x.get_x
computing
5
>>> x.get_x
5

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nosy: +pitrou, serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21145>
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