[issue7994] object.__format__ should reject format strings

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

This version of the patch adds support for classic classes and adds tests. Documentation still needs to be written.

Again, this diff is against trunk.

If anyone wants to review this, in particular the tests that exercise PendingDeprecationWarning, that would be great.

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keywords:  -easy
Added file: http://bugs.python.org/file16344/issue7994-1.diff

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