[Python-ideas] extensible template strings

[Mike Miller]

I also like this feature (of extensible string prefixes) and have encountered it 
in my research with Scala, Nim, and to some extent C#.  It feels like the right 
way to go, and could make a lot of code just "disappear".  It's somewhat 
analogous to context managers/with statement.

So far I'm calling these "string processors" and wonder how much resistance 
there is to the idea.  In short it means you would be able to define your own 
processors, as Yury mentioned:

     f''   ==> Format String
     i''   ==> i18n
     sql'' ==> Escaped SQL
     re''  ==> builds RegEx object

We could include a number of common needs while users could implement those 
specific to their applications.

(Should we keep them separate from existing prefixes?  I'm not sure about that 
part, perhaps we could advise that these new ones to be more than one character 
and not be composable.)

Is there interest in this feature?

-Mike