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Mon Jan 13 03:18:08 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-January/131352.html

On Sun, Jan 12, 2014 at 6:07 PM, Daniel Holth <dholth at gmail.com> wrote:
> Is there a formatting character that means "anything except a unicode
> string" to prevent accidentally interpolating a Unicode string into a
> bytes string without [a sane] encoding?

No, and we shouldn't introduce one. An operation should either work
for no type, one type, a few specific types, or all types. Something
that works for all but one type will *appear* to work for all types to
a casually experimenting user and may pass extensive unittests,
leaving a bomb that can detonate when you least expect it.

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

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[Python-Dev] PEP 460 reboot