[issue7994] object.__format__ should reject format strings

[HCT]

HCT added the comment:

I use lots of complicated format such as the following
"{:{:s}{:d}s}".format( self.pcs,self.format_align, self.max_length )

it looks like the way to do it from now on will be
"{!s:{:s}{:d}}".format( self.pcs,self.format_align, self.max_length )

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7994>
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