Eric Smith <e...@trueblade.com> added the comment:

I'm not sure I'm wild about doing the work twice, once as string and once as 
unicode if need be. But I'll consider it, especially since this is only a 2.7 
issue.

There could be side effects of evaluating the replacement strings, but I'm not 
sure it's worth worrying about. Attribute (or index) access having side effects 
isn't something I think we need to cater to.

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<http://bugs.python.org/issue7300>
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