Running a script with command line arguments

[MRAB]

 > 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".