Question about __getattribute__/__getattr__

holger krekel pyth at devel.trillke.net
Tue Oct 1 01:42:34 CEST 2002


Joao Prado Maia wrote:
> On Mon, 30 Sep 2002, holger krekel wrote:
> 
> > The important lines from the above link are:
> > 
> > def __call__(self, *args):
> >         if not self.memo.has_key(args):
> >             self.memo[args] = self.fn(*args)
> >         return self.memo[args]
> > 
> > and 'args' is a tuple of arguments.  
> > 'args[0]' would give you the first argument, for example.  
> > 
> 
> Correct. However, the same is not valid for __getattr__.

For caching a function's results why do you need __getattr__?

It seems you really need another caching policy than the prescribed
memoize pattern.  For example, you may implement a dictish object that evicts
old cached values by means of counting accesses, oldest access times
or whatever.  I still see no use for expecting __getattr_ to know about
the arguments.  Not?

    holger




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