[Python-ideas] String interpolation for all literal strings

[Eric V. Smith]

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On 08/07/2015 12:18 PM, Barry Warsaw wrote:
> On Aug 07, 2015, at 12:13 PM, Guido van Rossum wrote:
> 
>> OK, that sounds reasonable, except that translators need to
>> control substitution order, so s % tuple(...) doesn't work.
>> However, if we use s.format(...) we can use "This interpolates
>> {0} and {1}", and then I'm satisfied. (Further details of the
>> signature of __interpolate__ TBD.)
> 
> That doesn't work either, but this does:
> 
> "This interpolates {apples} and {oranges}".

I think it would, because you could say this, in some language where
the order had to be reversed:
"This interpolates {1} and {0}"

Now I'll grant you that it reduces usability. But it does provide the
needed functionality.

But I can't see how we'd automatically generate useful names from
expressions, as opposed to just numbering the fields. That is, unless
we go back from general expressions to just identifiers. Or, use
something like Nick's suggestion of also passing in the text of the
expressions, so we could map identifier-only expressions to their
indexes so we could build up yet another string.

Eric.

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