Perl vs. Python question...

[Paul Lussier]

Lloyd Kvam <python at venix.com> writes:

> If the value will be computed on demand, __getattr__ is one way to go.
>         def __getattr__(self, attr):
>             if attr == 'foo':
>                 return self.compute_foo()
>             elif ....
>             else:
>                 raise AttributeError( attr + ' is invalid name')
>
> This is the 'traditional' approach.  __getattr__ is *only* called when
> an attribute is not found.  If you wanted to save the computed value, so
> that __getattr__ was no longer used:
> 	self.__dict__['foo'] = self.compute_foo()
> 	return self.foo
>
> HTH

Very much so!

--
Thanks,
Paul