[issue16853] add a Selector to the select module

[Guido van Rossum]

Guido van Rossum added the comment:

Giampaolo, there are many details in the Tornado and pyftpdlib I/O loops that may or may not be intentional.  I wrote the Tulip pollster from scratch but am looking to merge in relevant knowledge and features from Tornado, Twisted and pyftpdlib.  AFAIK the code here is mostly adapted from Tulip.  Please suggest specific features from Tornado or pyftpdlib that are currently missing.  However I don't think we should just copy over the existing 3rd party code (if only because we're trying to write pure Python 3.3 code here, without historical baggage).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16853>
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