[Zope3-dev] zope3-dev proposal on changing implicitly calling

[Chris Withers]

Steve Alexander wrote:
> UTSL :-)

I'm hoping to get back into Zope 3 some time soon, in the meantime, that don't 
help me much ;-)

> Ok, I'll save you looking at the code:
> 
>     if getattr(r, '__class__', 0) == MethodType:
>         return r()

Oooo... is that a Python 2.3 ism?

Shouldn't it be:

if isintance(r,MethodType):
    return r()

?

> Like I said, at this point, the calling behaviour applies only to the 
> default traversable adapter, and only to methods.

But, for the default traverser, it applies to all segments, not just the last 
one? If so, cool :-)

> Why would you want to do something different than the traversable 
> adapter for the objects you are traversing?

Well, do all object implement traversable adapters? I would haev thought most 
would just use the default traverser? In that case, wouldn't you need to 
implemetn a traverser if you wanted traversal from that object to the next name 
in the path to not have the result of traversing that name being called?

>> ...so you'd have to write a specia ltraverse in this case?
> 
> If you have special traversal requirements for particular objects, you 
> can write a special traversable adapter that knows how to traverse those 
> objects.

:-)

Chris