[Python-3000] Substantial rewrite of PEP 3101

[Talin]

Nick Coghlan wrote:
> Talin wrote:
>> What I wanted to avoid in the PEP was having to specify how all of 
>> these different parts fit together and the exact nature of the 
>> parameters being passed between them.
>>
>> And I think that even if we do break up vformat this way, we still end 
>> up with people having to replace a fairly substantial chunk of code in 
>> order to change the behaviors represented by these flags.
> 
> If you make the methods to be overridden simple stateless queries with a 
> True/False return like the two I suggested in my other message, then it 
> becomes easy to tailor these behaviours without replacing the whole parser.
> 
> For cases where changing the behaviour of those cases isn't enough then 
> you would still have the option of completely overriding vformat.

I don't have a problem with this approach either.

-- Talin