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Here is one collection of some simple python code.

To read a data file, the file is stored with the Sage notebook in a directory labelled DATA by Sage.

import csv
data =list( csv.reader(open(DATA+'infile.csv','rU')) )

The data is then in a list that you can manipulate.

Some code for writing a list named info that contains lists is:

writefile = csv.writer(open(DATA+'outfile.csv', 'w'))
for i in range(0,len(info)): 
      writefile.writerow(info[i])