[issue2772] Add PendingDeprecationWarning for % formatting

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

On Wed, May 7, 2008 at 10:33 AM, Eric Smith <report at bugs.python.org> wrote:
>  I think a better approach will be to remove % formatting from
>  warnings.py.  I think that will remove the need for any checks at all.
>  I'll investigate that.

That would make user code warning that uses '%"' brittle. However, if
we warn about it, I think it's ok.

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