[Python-Dev] PEP 461: Adding % formatting to bytes and bytearray -- Final, Take 2

Antoine Pitrou solipsis at pitrou.net
Mon Feb 24 18:43:04 CET 2014


On Mon, 24 Feb 2014 09:15:29 -0800
Ethan Furman <ethan at stoneleaf.us> wrote:
> On 02/23/2014 02:54 PM, Nick Coghlan wrote:
> >
> > It's a harm containment tactic, based on the assumption people *will*
> > want to include the output of ascii() in binary protocols containing
> >  ASCII segments, regardless of whether or not we consider their reasons
> > for doing so to be particularly good.
> 
> One possible problem with %a -- it becomes the bytes equivalent of %s in Python 2 strings, with the minor exception of 
> how unicode strings are handled (quote marks are added).  In other words, instead of %d, one could use %a.
> 
> On the other hand, %a is so much more user-friendly than b'%s' % ('%d' % 123).encode('ascii', errors='backslashreplace').

But why not b'%d' % 123 ?

Regards

Antoine.




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