[Python-Dev] New syntax for 'dynamic' attribute access

[Maric Michaud]

Le mardi 13 février 2007 01:36, Barry Warsaw a écrit :
> On Feb 12, 2007, at 7:32 PM, Guido van Rossum wrote:
> > Oh, now I am definitely in favor of .[]! I read it in gmail in FireFox
> > which uses a small variable-pitch font whose dot is a single pixel.
> > The .() example was hard to find; the .[] jumped out immediately.
> > (When do you ever see self[anything]?)
>
> Raymond's -> suggestion was nice.
>
I really dislikes the .[ or .( or .{ operators.
Just on my mail editor the two expressions

a.[b]

and

a,[b]

are quite hard to differentiate while completely unrelated.

Why did the brace syntax wasn't even discussed ? Seems clean to me.

obj{expr} can be read as "given obj as a namespace, retrieve the name 
resulting by expr in obj and enclosing namespaces (supers)".

We can even use slice-like syntax for further improvements :

obj{expr:default} 

obj{expr:default:type_}
   something like getattr(super(type_, obj), expr, default), or even

obj{expr::}
   for getattr(super(obj.__class__, obj), expr)

and, why not, even obj{:} for super(obj.__class__, obj), 

regards,