Nikolaus Rath <nikol...@rath.org> added the comment:

Not sure what you mean with "posted as a recipe" -- are you thinking of a 
specific website/mailing list?

Example: which one do you mean? The one in the issue or the one in the patch?

With statement: what advantages do you have in mind?

Try/finally: I think the patch and the discussion in python-ideas talk about 
the advantage over try/finally. IMO the two most important points are: (1) 
avoids deep and pointless indendation for multiple ressources, (2) keeps 
logically connected lines (allocation+cleanup) closely together in the source 
instead of splitting them far apart like try/finally.

error-prone: not sure if I understand you correctly. If there is an error prior 
to registration, the callback will not be called (that's a feature). To what 
kind of errors could that lead?


Sorry for basically asking you to re-explain every sentence, but I honestly 
don't understand most of your message.

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<http://bugs.python.org/issue13585>
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