argument checking before getattr

[Benjamin Tai]

Hi Jason,

> > I guess __getattr__ would apply the function object
> > internally. Would it?
>
> No.  If you write code like
>   print object.attribute
> then Python does, basically,
>   print getattr(object, 'attribute')
>
> If you write:
>   object.method(args)
> then Python does, basically:
>   m = getattr(object, 'method')
>   m(args)
>
> When you override __getattr__, it only changes
> the getattr behavior.  __getattr__ does not call
> the method.  The method still gets called
> as usual, with the arguments you provide.

Thank you very much for the reply. This is a different level of
understanding. How do you find these information? Presently I am reading
both of Mart Lutz books. Have I missed out too many chapters?

Ben