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

[Terry Reedy]

Benjamin Peterson wrote:
> 2009/10/2 Raymond Hettinger <python at rcn.com>:
>> [Terry Reedy]
>>> I would agree, for instance, that an auto-translation tool is needed.
>> We should get one written.  ISTM, every %-formatting
>> string is directly translatable to an equivalent {}-formatting string.
> 
> Yes, but not all are possible to guess with mere static analysis.

Even if perfect is not possible, decently good would probably cover a 
lot of use cases.