What does this line of code mean?

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Date	Sun, 16 Nov 2014 22:45:32 +0100
Subject	What does this line of code mean?
From	Abdul Abdul <abdul.sw84@gmail.com>
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I just came across the following line of code:

outputfile = os.path.splitext(infile)[0] + ".jpg"

Can you kindly explain to me what those parts mean?

Thanks.

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What does this line of code mean? Abdul Abdul <abdul.sw84@gmail.com> - 2014-11-16 22:45 +0100
  Re: What does this line of code mean? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-11-16 23:07 +0100
  Re: What does this line of code mean? Rick Johnson <rantingrickjohnson@gmail.com> - 2014-11-19 19:42 -0800

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