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Mon Feb 24 19:40:46 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-February/132743.html

Okay, types corrected, most comments taken into account.

%b is right out, %a is still suffering scrutiny.

The arguments seem to boil down to:

We don't need it.

vs

Somebody might, and it's better than having them inappropriately add a __bytes__ method if we don't have it.

"We don't need it" doesn't really need any further explanation.

Does anybody have any examples where %a could be useful?  Considering the work-arounds are either wrong or painful, it 
wouldn't take much to sway me towards keeping it, but at the moment it seems to be a YAGNI, plus we could always add it 
later if it turns out to be useful.  (For that matter, we could implement the main portion of the PEP now, and maybe a 
%a use-case will show up before 3.5 is released and we could add it then.)

So, any last thoughts about %a?

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Showing content from https://mail.python.org/pipermail/python-dev/2014-February/132743.html below:

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