[Python-Dev] Multiple dicts for string interpolation?

[Jim Fulton]

Tim Peters wrote:
> 
(snip)
> I wasn't aware of the MultiDict approach Skip mentioned,

See the MultiMapping module in ExtensionClass. You can get the
latest flavor of this in the latest Zope release.

> but thought it
> looked spot on for the general case!  Skip, is the long-windedness of
> 
>     dict = MultiDict()
>     dict.append(d1)
>     dict.append(d2)
>     ...
>     s = format % dict

Note the rather important *stack* sematics of
MultiMappings.  We often push and pop namespaces 
on and off of MultiMappings in use.
 
> the part you didn't like about that?  If so, how about changing the
> constructor to
> 
>     def __init__(self, *dicts):
>          ...
> 
> instead so you could use it as a one-liner
> 
>     format % MultiDict(d1, d2, ...)
> 
> ?  That's exactly the same as the tuple idea, except there's a nice
> descriptive word in the middle of it <wink>.

This is exactly what the current MultiMapping "class" does.

Jim

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