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Mon Oct 5 07:30:45 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-October/092563.html

> I agree with this 100% but I can't see it working unless we have some
> sort of transition plan. Just saying "ok, switch your format strings
> from % to {}" didn't work in Python 3.0 for various good reasons, and
> I can't imagine it will work in Python 4.0 unless we have a transition
> plan.

That doesn't mean we have to have a transition plan *now*. Creating one
after Python 3.5 is released (i.e. in 2015 or so) might be sufficient.

To create a transition plan, you first need *consensus* that you
actually do want to transition. I don't think such consensus is
available, and might not be available for a few more years. Pushing
the issue probably delays obtaining consensus.

Regards,
Martin

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[Python-Dev] transitioning from % to {} formatting