How can you get a descriptor to return an identical value, each time
it's called with the same "instance" - without leaking memory?
#!/usr/bin/env python
class descriptor:
class __metaclass__(type):
def __get__(self, instance, owner):
...
class owner:
descriptor = descriptor
instance = owner()
I want ">>> instance.descriptor is instance.descriptor" to evaluate True
I was thinking of "caching" descriptor return values? Like a dictionary
of instances and descriptor return values? I was thinking of using
weakref.WeakKeyDictionary to avoid leaking memory? But I can't guarantee
that the descriptor return value won't indirectly reference the
instance, in which case weakref.WeakKeyDictionary *does* leak memory?
Does anyone know how to get a descriptor to return an identical value,
each time it's called with the same "instance" - without leaking memory?
Much thanks!
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