[SOLVED] Requiring help running an old Python script (non Python savvy user)

[Miletkir]

Hey there,

I came across a rather old Python script that lets you convert *.csv files into a *.gml format, which can then be read by a program called yED, allowing you to make user-friendly organigrams (more info here).

The included guide says to run the following command:
GMLMaker.py -L 10 filename.csv

But this gives:

Output:
SyntaxError: invalid syntax

with Python 3.9.1 (tags/v3.9.1:1e5d33e, Dec 7 2020, 17:08:21) [MSC v.1927 64 bit (AMD64)] on win32

Checking the module with IDLE, it finds invalid syntax here:
print "Loading #%d: %s" % (index, starNode[1])

I know nothing about Python, but I'd really like to run this script. I was wondering if someone here could identify the issue.

Cheers,

Mil