[Python-Dev] transitioning from % to {} formatting

[Terry Reedy]

James Y Knight wrote:
 > allow users to use newstyle string substitution with every API.

However it is done, I think someone (like new Python programmers) should 
be able to program in Python3, and use everything in the stdlib, without 
ever learning % formatting -- and that I should be able to forget about 
it ;-).

+10 on the goal.

Terry Jan Reedy