How to Calculate NPV?

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Subject	How to Calculate NPV?
From	ryguy7272 <ryanshuell@gmail.com>
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I am using Spyder Python 2.7.  I'm running this sample code.

import scipy as sp
cashflows=[50,40,20,10,50]
npv=sp.npv(0.1,cashflows)
round(npv,2)


Now, I'm trying to get the NPV, and I don't see any obvious way to get it.  
The author of the book that I'm reading gets 144.56.  I think that's wrong, but I don't know for sure, as Python won't do any calculation at all.  It's easy to enter code and run it, but I can't tell how to get Python to actually DO the calculation.

Any idea what I'm doing wrong?

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How to Calculate NPV? ryguy7272 <ryanshuell@gmail.com> - 2015-07-29 06:58 -0700
  Re: How to Calculate NPV? Saber Ayoub Chelaghma <saber.chelaghma@gmail.com> - 2015-07-29 07:09 -0700
  Re: How to Calculate NPV? ryguy7272 <ryanshuell@gmail.com> - 2015-07-29 07:21 -0700
    Re: How to Calculate NPV? ryguy7272 <ryanshuell@gmail.com> - 2015-07-29 07:27 -0700
      Re: How to Calculate NPV? duncan smith <buzzard@invalid.invalid> - 2015-07-29 17:14 +0100
    Re: How to Calculate NPV? Terry Reedy <tjreedy@udel.edu> - 2015-07-29 15:08 -0400
    Re: How to Calculate NPV? Dave Farrance <df@see.replyto.invalid> - 2015-07-30 15:18 +0100

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