Rik Poggi <poggi.ri...@gmail.com> added the comment:

I wasn't trying to make any argument, just thinking that such particular 
signature was intentional.

Also notice that there might be code that doesn't pass the pattern argument, 
and fall back on the default value. So a signature change will break their 
code. I think that the best solution would be to provide a better 
documentation. 

I don't know what's the rational behind all that.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11218>
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