language: Python (python 2.7.3)
date: 189 days 11 hours ago
link:
visibility: private 
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import csv
import fileinput
import sys
 
reader = csv.reader(fileinput.input(inplace=True))  # modify input files inplace
writer = csv.writer(sys.stdout)  # fileinput redirects stdout to input file
                                                # after input file has been copied to a temporary file
for row in reader:
     row += [row[-1]]  # duplicate last column
     writer.writerow(row)