Terry J. Reedy <tjre...@udel.edu> added the comment:

Thank you for the 'positive lookbehind assertion' for anchoring the match after 
'('. That is what I was missing. '[^,]' is too broad as, in particular, it 
matches the ')' in 'a(self)'. We don't want the ')' removed. The tests passed 
with a faulty re because the method test was faulty in that it only tested that 
something is removed, but not that the removal is correct. I fixed the tests 
also to really test proper removal.

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<http://bugs.python.org/issue12510>
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