Guido van Rossum wrote:
... Though I doubt that string % is taught in hour two -- you cna do everything you want with str() and string concatenation, both of which *are* taught in hour two.
If there were an easy way to do interpolation I might well want to teach it before any of str() or string concatenation. And I would probably treat it in preference to the magic and special "," operator of the print statement. I prefer to teach something that is generally useful like $ rather than something which they may have to unlearn like "," -- unlearn to the extent that they will naturally expect that commas in other contexts will do whitespace-generating concatenation and they hardly ever will.