On 1/10/2014 6:02 PM, Antoine Pitrou wrote: > On Fri, 10 Jan 2014 14:58:15 -0800 > Ethan Furman <et...@stoneleaf.us> wrote: >> On 01/10/2014 02:42 PM, Antoine Pitrou wrote: >>> On Fri, 10 Jan 2014 17:33:57 -0500 >>> "Eric V. Smith" <e...@trueblade.com> wrote: >>>> On 1/10/2014 5:29 PM, Antoine Pitrou wrote: >>>>> On Fri, 10 Jan 2014 12:56:19 -0500 >>>>> "Eric V. Smith" <e...@trueblade.com> wrote: >>>>>> >>>>>> I agree. I don't see any reason to exclude int and float. See Guido's >>>>>> messages http://bugs.python.org/issue3982#msg180423 and >>>>>> http://bugs.python.org/issue3982#msg180430 for some justification and >>>>>> discussion. >>>>> >>>>> If you are representing int and float, you're really formatting a text >>>>> message, not bytes. Basically if you allow the formatting of int and >>>>> float instances, there's no reason not to allow the formatting of >>>>> arbitrary objects through __str__. It doesn't make sense to >>>>> special-case those two types and nothing else. >>>> >>>> It might not for .format(), but I'm not convinced. But for %-formatting, >>>> str is already special-cased for these types. >>> >>> That's not what I'm saying. str.__mod__ is able to represent all kinds >>> of types through %s and calling __str__. It doesn't make sense for >>> bytes.__mod__ to only support int and float. Why only them?
Ah, I see. This is about the types that %s supports, not about support for %d and %f. >> Because embedding the ASCII equivalent of ints and floats in byte streams >> is a common operation? > > Again, if you're representing "ASCII", you're representing text and > should use a str object. Yes, but is there existing 2.x code that uses %s for int and float (perhaps unwittingly), and do we want to "help" that code out? Or do we want to make porters first change to using %d or %f instead of %s? I'll grant you that we might be doing more harm than help by special-casing these types. I'm just asking. I think what you're getting at is that in addition to not calling __format__, we don't want to call __str__, either, for the same reason. Correct me if I'm off base, please. I'm not trying to put words in anyone's mouth. In any event, I think supporting %d and %f (and %i, %u, %x, %g, etc.) inside format strings would be useful. Eric. _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
