Feedback Thread: DIP 1036--Formatted String Tuple Literals--Community Review Round 1

[Alex Dovhal]

On Wednesday, 9 September 2020 at 19:48:44 UTC, Steven 
Schveighoffer wrote:
>> 3) `${%d}bananas` is an awful syntax compromise as it will be 
>> very unintuitive to newcomers as it's not clear what the 
>> variable is.
>> For example, `${bananas:2f}` would read much better. In 
>> general, I like the way Python handles the format specifiers:
>> 
>> https://www.python.org/dev/peps/pep-0498/#format-specifiers
>
> That is syntactically a problem. Remember that any expression 
> can be the Argument to the string interpolation parameter. A 
> colon followed by 2f could be valid syntax at the end of an 
> expression.
>
> ${cond ? 1f:2f}
>
> If there are unambiguous alternatives that would be more 
> acceptable to the language maintainers, we are fine with it, as 
> long as the format string resolves in the way specified with 
> the DIP. Note that this syntax comes directly from DIP1027.

How about ${expr; %2f} or ${expr, %2f} ?