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On Tue, Feb 10, 2009 at 2:36 PM, Cesare Di Mauro <cesare.dimauro@a-tono.com> wrote:

OK, so I can make assumptions only for built-in types.

Yes, but even there you have to be careful of odd corner-cases, such as:

>>> nan = float('nan')
>>> nan < nan
False
>>> nan >= nan
False

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Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC