Florent Xicluna <florent.xicl...@gmail.com> added the comment:

The documentation for porting is already clear about using "-3" switch.
http://docs.python.org/dev/howto/pyporting.html#eliminate-3-warnings

The argparse module is different because it is not in the stdlib in 2.6, and 
you can stay with optparse if you write code compatible with all versions 
between 2.6 and 3.3.

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<http://bugs.python.org/issue15420>
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