Skip Montanaro wrote:
>
> Every once in awhile I want to perform string interpolation using more than
> one dictionary. One way is to build a dictionary that's a union of multiple
> dictionaries:
>
> dict = {}
> dict.update(d1)
> dict.update(d2)
> ...
> s = format % dict
>
> Another way is the MultiDict approach that Digital Creations (used to?) use
> in their DocumentTemplate module (I can't remember the exact usage any
> more):
>
> dict = MultiDict()
> dict.append(d1)
> dict.append(d2)
Actually, push (and pop). The namspaces are managed as a stack.
> ...
> s = format % dict
>
> A MultiDict object maintains a list of the dicts it's been fed and searches
> them in order when __getitem__ is called.
>
> I'd like to propose a third alternative. How about if the string
> interpolation function accepted a tuple of dictionaries directly:
>
> s = format % (d1, d2)
>
> It would only be used when named interpolation was expected. I don't think
> there would be any conflict with current % operator semantics.
Yes. In the current semantics, you output the two dictionaries.
Try:
'%s %s' % ({'hello':'skip'},{})
Jim
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