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Python 3.5, bytes, and %-interpolation (aka PEP 461)

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Date Mon, 24 Feb 2014 11:54:54 -0800
From Ethan Furman <ethan@stoneleaf.us>
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Subject Python 3.5, bytes, and %-interpolation (aka PEP 461)
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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'

and generic:

   b'%s' % some_binary_blob --> b'tHE*&92h4' (or whatever)

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?

--
~Ethan~

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Thread

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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