[issue2772] Add PendingDeprecationWarning for % formatting

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

I think this is premature until be know for sure that % formatting will 
in-fact be deprecated in Py3.1.  Time will tell how well the new format 
options get accepted.  Likewise, we'll learn more about how readily 
legacy code can get converted.

Guido, can you pronouce?

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assignee:  -> gvanrossum
nosy: +gvanrossum, rhettinger

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<http://bugs.python.org/issue2772>
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