[Python-Dev] PEP-498: Literal String Formatting

[Eric V. Smith]

On 8/8/2015 9:08 PM, Tim Delaney wrote:
> On 8 August 2015 at 11:39, Eric V. Smith <eric at trueblade.com
> <mailto:eric at trueblade.com>> wrote:
> 
>     Following a long discussion on python-ideas, I've posted my draft of
>     PEP-498. It describes the "f-string" approach that was the subject of
>     the "Briefer string format" thread. I'm open to a better title than
>     "Literal String Formatting".
> 
>     I need to add some text to the discussion section, but I think it's in
>     reasonable shape. I have a fully working implementation that I'll get
>     around to posting somewhere this weekend.
> 
>     >>> def how_awesome(): return 'very'
>     ...
>     >>> f'f-strings are {how_awesome()} awesome!'
>     'f-strings are very awesome!'
> 
>     I'm open to any suggestions to improve the PEP. Thanks for your
>     feedback.
> 
> 
> I'd like to see an alternatives section, in particular listing
> alternative prefixes and why they weren't chosen over f. Off the top of
> my head, ones I've seen listed are:
> 
> !
> $

I'll add something, but there's no particular reason. "f" for formatted,
along the lines of 'r' raw, 'b' bytes, and 'u' unicode.

Especially when you want to combine them, I think a letter looks better:
fr'{x} a formatted raw string'
$r'{x} a formatted raw string'

Eric.