Relaxing `t-string` conversion restriction

[blhsing (Ben Hsing)]

@dg-pb

E.g.: Type convertion for f-string

I see in that thread you suggested the following conversions:

@dg-pb

I added n/N/t/T to string.Formatter for myself:

!n = obj.__qualname__
!N = obj.__module__:obj.__qualname__
!t = type(obj).__qualname__
!T = type(obj).__module__:type(obj).__qualname__

To me, those belong in the format spec rather than a conversion.

A format spec tells the formatter how you want an object to be formatted into a string, while a conversion is more about encoding the output after the formatting is done.

But then yeah I can see how it might make sense to allow custom encoding.

@dg-pb

C formatting has many more

In C formatting the conversion specifier is part of the format string, so it isn’t really a case that supports your proposal.