[Python-Dev] RFC: PEP 460: Add bytes % args and bytes.format(args) to Python 3.5 (original) (raw)

Benjamin Peterson bp at benjamin-peterson.org
Tue Jan 7 23:33:26 CET 2014

On Tue, Jan 7, 2014, at 12:46 PM, Barry Warsaw wrote:

On Jan 07, 2014, at 10:40 AM, Georg Brandl wrote:

>Very nice, thanks. If I was to make a blasphemous suggestion I would >even target it for Python 3.4. (No, seriously, this is a big issue >- see the recent discussion by Armin - and the big names involved show >that it is a major holdup of 3.x uptake.) It would of course depend >a lot on how much code from unicode formatting can be retained or >adapted as opposed to a rewrite from scratch. I think we should be willing to entertain breaking feature freeze for getting this in Python 3.4. It's a serious enough problem, and Python 3.4 will be fairly widely distributed. For example, it will be a supported version in the next Debian release and in Ubuntu 14.04 LTS, and possibly the default Python 3 version. However, I think we'd need to see how disruptive the code changes are first, and get good review of any proposed patches. Larry and Guido would have to be on board with the exemption as well.

I agree. This is a very important, much-requested feature for low-level networking code.

If adopted for Python 3.4, PEP 460 should be modest in its goals, but I think I'd still like to see the following excluded and unknown features added: * Attribute access: {obj.attr} * Indexing: {dict[key]} * format keywords? b'{arg}'.format(arg=5) * str % dict ? b'%(arg)s' % {'arg': 5)

Yes, I don't think we need to support very much of the formatting language cover 99.8% of formating cases for bytes.

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