[Python-3000] Iterators for dict keys, values, and items == annoying :)

[Greg Ewing]

Benji York wrote:
> If I, as the user of the interface, have something I want to 
> pass in that doesn't match I it to the appropriate interface the burden 
> is on me to create something that matches expectations.  People do that 
> all the time today without an interface/adaption framework, they just 
> write code that takes one thing and builds another.

Yes, and that seems like a fine way of doing it. You
know what you've got and where you want to get to, so
there's no need to look anything up in a registry.

> Instead of building an API for looking up security descriptions from a 
> user name that I have to pull out of the user object, I could instead 
> register and adapter from IUser to ISecurityInfo,

I don't see how this is better than just calling
a get_security_info_from_user() function, the
implementation of which can be changed if necessary
without affecting any code that calls it.

>   Looping over the form fields and adapting each to IWidget and getting 
> back a TextField for a string, CheckBox for a boolean, etc.

Here I don't see how it's better than passing in
a dict mapping field classes to widget classes.
Worse, in fact, since it would seem to restrict
you to a single global mapping for all forms.

> once you have the simple tools of adaptation in mind
 > ... you start to recognize places where they help
> you solve problems in better ways.

Or they lead you into an everything-is-a-nail
mode of thinking, which is what the above seem
to be to me, to some extent.

--
Greg