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Yes, #3, and what Tim says.

On Wed, Mar 28, 2018, 11:44 Serhiy Storchaka <storchaka@gmail.com> wrote:

28.03.18 19:20, Guido van Rossum пише:

\> Hm, without thinking too much about it I'd say it's okay to change the
\> evaluation order.

Do you mean the option 3, right? This is the simplest option. I have
already wrote a PR for optimizing old-style formating \[1\], but have not
merged it yet due to this change of semantic.

\> Can these optimizations be disabled with something like -O0?

Currently there is no way to disable optimizations. There is an open
issue with a request for this. \[2\]

\[1\] https://github.com/python/cpython/pull/5012
\[2\] https://bugs.python.org/issue2506