[Python-ideas] Draft PEP on string interpolation

[Barry Warsaw]

On Aug 21, 2015, at 04:21 PM, Mike Miller wrote:

>The more I think about it, trying to push str.format() (or similar) syntax
>into i18n is just too much.  We'll need a different prefix anyway because of
>the compile/runtime differences so why not stick with str.Template
>formatting?
>
>It fits the use case perfectly, and requires little additional work.

The main annoyance with string.Template based approaches is the same as
str.format() -- the requirement to use sys._getframe() to access the
interpolation values.  I think this was one of the main reasons to propose new
syntax, since the compiler can parse the interpolation string and arrange for
the values to be composed into a substitution dictionary without having to do
ugly locals/globals references.  I think this is also Guido's main gripe about
the current function-based implementations.

I still wish we could solve this more limited problem, but I don't see a way
around that without adding syntax, and if you're going to do that, then I
think most people want to go down the whole PEP 498/501 road.

Cheers,
-Barry
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