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Showing content from https://mail.python.org/pipermail/python-dev/2014-January/131351.html below:

[Python-Dev] PEP 460 reboot

[Python-Dev] PEP 460 reboot [Python-Dev] PEP 460 rebootGuido van Rossum guido at python.org
Mon Jan 13 03:11:47 CET 2014
On Sun, Jan 12, 2014 at 5:27 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> On 01/12/2014 04:47 PM, Guido van Rossum wrote:
>> %s seems the trickiest: I think with a bytes argument it should just
>> insert those bytes (and the padding modifiers should work too), and
>> for other types it should probably work like %a, so that it works as
>> expected for numeric values, and with a string argument it will return
>> the ascii()-variant of its repr(). Examples:
>>
>> b'%s' % 42 == b'42'
>> b'%s' % 'x' == b"'x'" (i.e. the three-byte string containing an 'x'
>> enclosed in single quotes)
>
> I'm not sure about the quotes.  Would anyone ever actually want those in the
> byte stream?

Perhaps not, but it's a hint that you should probably think about an
encoding. It's symmetric with how '%s' % b'x' returns "b'x'". Think of
it as payback time. :-)

-- 
--Guido van Rossum (python.org/~guido)
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