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[Python-Dev] the not operator (and the __not__ special method)

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On Thu, Oct 03, 2002, Brian Quinlan wrote:
>
> > shows that python doesn't call the __not__ special method
> > in a 'not' operator statement.
> 
> Python calls the special __nonzero__ method so check the truth value of
> an object.

Mark McEahern provided the full answer: Python uses __len__, too.
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