[issue19165] Change formatter warning to DeprecationWarning in 3.5

[Brett Cannon]

Brett Cannon added the comment:

Esa is right; this is a placeholder bug to remind me to do this in Python 3.5.

And Esa is also right about adding formatter to PEP 4; I'll reopen the original bug to remind me to do that.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19165>
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