How to write a python code which copies a unique column from an output file to a .csv file

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There are a couple of ways you can do this. The best option is probably the python module for .csv operations.
An example taken from the docs is:

import csv
with open('some.csv', 'wb') as f:
    writer = csv.writer(f)
    writer.writerows(someiterable)

Hope this helped.

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