On Sun, 9 Aug 2015 at 01:07 Stefan Behnel <stefan...@behnel.de> wrote:
> Eric V. Smith schrieb am 08.08.2015 um 03:39: > > 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. > > [copying my comment from python-ideas here] > > How common is this use case, really? Almost all of the string formatting > that I've used lately is either for logging (no help from this proposal > here) or requires some kind of translation/i18n *before* the formatting, > which is not helped by this proposal either. Meaning, in almost all cases, > the formatting will use some more or less simple variant of this pattern: > > result = process("string with {a} and {b}").format(a=1, b=2) > > which commonly collapses into > > result = translate("string with {a} and {b}", a=1, b=2) > > by wrapping the concrete use cases in appropriate helper functions. > > I've seen Nick Coghlan's proposal for an implementation backed by a global > function, which would at least catch some of these use cases. But it > otherwise seems to me that this is a huge sledge hammer solution for a > niche problem. > So in my case the vast majority of calls to str.format could be replaced with an f-string. I would also like to believe that other languages that have adopted this approach to string interpolation did so with knowledge that it would be worth it (but then again I don't really know how other languages are developed so this might just be a hope that other languages fret as much as we do about stuff).
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