On Fri, Jul 29, 2011 at 5:01 PM, Ian Kelly <[email protected]> wrote:
> On Mon, Jul 25, 2011 at 11:46 AM, Jack Bates <[email protected]> wrote:
>> How can you get a descriptor to return an identical value, each time
>> it's called with the same "instance" - without leaking memory?
Oops, that should have been:
class MyDescriptor(object):
def __get__(self, instance, owner):
try:
return instance.__cached_value[self]
except AttributeError:
instance.__cached_value = {self: get_value(instance, owner)}
except KeyError:
instance.__cached_value[self] = get_value(instance, owner)
return instance.__cached_value[self]
class MyClass(object):
my_attribute = MyDescriptor()
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