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Date: Mon, 02 May 2011 19:26:34 +0100
From: MRAB <python@mrabarnett.plus.com>
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Subject: Re: Running a script with command line arguments
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:4491

 > Hi,
 > I'm new to python and trying to run a borrowed script. The error I
 > get suggests that I need to give a proper command to run it. The
 > input file is "c26_1plus.csv" and the intended output file is
 > "c26_1plus_backbone.csv".
 >
 > Can anyone help?
 >
The usage string in the script says that the required arguments are:

     input_file output_file backbone_alpha [file delimiter]

You're providing "input_file" and "output_file" but not "backbone_alpha".