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Wed Sep 30 03:16:33 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-September/092332.html

On Tue, Sep 29, 2009 at 5:54 PM, Benjamin Peterson <benjamin at python.org> wrote:
> * Provide a flag to Formatter which controls whether new or old
> formatting is used. Emit a warning when it's not true.

So then the transition strategy is something like:

version N: Add formatting flag which uses {}-style formatting on True
and %-style formatting on False, which defaults to False
version N + 1: Deprecate False value for formatting flag (all code
should start specifying flag=True)
version N + 2: Raise error on False value for formatting flag (all
code must specify flag=True)
version N + 3: Deprecate formatting flag
version N + 4: Remove formatting flag

?

Steve
-- 
Where did you get that preposterous hypothesis?
Did Steve tell you that?
        --- The Hiphopopotamus

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