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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 8 Jan 2015 07:24:12 -0700
Subject: Re: where in Nan defined
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On Thu, Jan 8, 2015 at 7:15 AM, maurog <qualsivoglia@dovetipare.nz> wrote:
> I'm running some pandas examples and I canno find in what module NaN is
> defined. Does anyone know what module I have to import in order to have
> it defined?

It's not defined anywhere. To get nan as a literal just do:

    nan = float("nan")