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Groups > comp.lang.python > #67009
| Date | 2014-02-24 16:10 -0800 |
|---|---|
| From | Ethan Furman <ethan@stoneleaf.us> |
| Subject | Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) |
| References | <mailman.7328.1393271688.18130.python-list@python.org> <530bdbe2$0$29985$c3e8da3$5496439d@news.astraweb.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.7333.1393288494.18130.python-list@python.org> (permalink) |
On 02/24/2014 03:55 PM, Steven D'Aprano wrote: > On Mon, 24 Feb 2014 11:54:54 -0800, Ethan Furman wrote: > >> Greetings! >> >> A PEP is under discussion to add %-interpolation back to the bytes type >> in Python 3.5. >> >> Assuming the PEP is accepted, what *will* be added back is: >> >> Numerics: >> >> b'%d' % 10 --> b'10' >> b'%02x' % 10 --> b'0a' >> >> Single byte: >> >> b'%c' % 80 --> b'P' > > Will %c also accept a length-1 bytes object? > > b'%c' % b'x' > => b'x' Yes. >> and generic: >> >> b'%s' % some_binary_blob --> b'tHE*&92h4' (or whatever) > > Will b'%s' take any arbitrary object, as in: > > b'Key: %s' % [1, 2, 3, 4] > => b'Key: [1, 2, 3, 4]' No. > or only something which is already bytes (i.e. a bytes or bytearray > object)? It must already be bytes, or have __bytes__ method (that returns bytes, obviously ;) . >> What is under debate is whether we should also add %a: >> >> b'%a' % some_obj --> b'some_obj_repr' >> >> What %a would do: >> >> get the repr of some_obj >> >> convert it to ascii using backslashreplace (to handle any code points >> over 127) >> >> encode to bytes using 'ascii' >> >> Can anybody think of a use-case for this particular feature? > > Not me. I find that humorous, as %a would work with your list example above. :) -- ~Ethan~
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Python 3.5, bytes, and %-interpolation (aka PEP 461) Ethan Furman <ethan@stoneleaf.us> - 2014-02-24 11:54 -0800
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) Marko Rauhamaa <marko@pacujo.net> - 2014-02-24 22:46 +0200
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) random832@fastmail.us - 2014-02-24 16:04 -0500
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) Marko Rauhamaa <marko@pacujo.net> - 2014-02-25 00:18 +0200
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-02-24 23:55 +0000
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) wxjmfauth@gmail.com - 2014-02-25 00:07 -0800
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-25 08:29 +0000
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) Ethan Furman <ethan@stoneleaf.us> - 2014-02-24 13:53 -0800
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-02-24 23:55 +0000
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) Ethan Furman <ethan@stoneleaf.us> - 2014-02-24 16:10 -0800
Re: Python 3.5, bytes, and %-interpolation (aka PEP 461) Steven D'Aprano <steve@pearwood.info> - 2014-02-25 07:29 +0000
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