Running a script with command line arguments

[Shafique, M. (UNU-MERIT)]

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?

BR, Shafique

Error log:

C:\Users\Shafique>extract_backbone.py c:\python26\c26_1plus.csv 
c:\python26\c26_1plus_backbone
Traceback (most recent call last):
  File "C:\Python26\extract_backbone.py", line 31, in <module>
    alpha   = float(sys.argv[3])
IndexError: list index out of range

Excerpts from code:

#!/usr/bin/env python

import sys, os
import networkx

def extract_backbone(G, weights, alpha):
blablabla...

if __name__ == '__main__':
    
    if "-h" in sys.argv[1:] or "--help" in sys.argv[1:]:
        usage = """python %s input_file output_file backbone_alpha [file 
delimiter]"""
        sys.exit(usage)
    
    in_file = sys.argv[1]
    ot_file = sys.argv[2]
    alpha   = float(sys.argv[3])
    try:
        delimiter = sys.argv[4]
    except:
        delimiter = "\t"
...blablabla...

# save the new edgelist:
    f = open(ot_file, 'w')
    for ni,nj in G_backbone.edges():
        f.write("%s%s%s\n" % (ni,delimiter,nj) )
    f.close()
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