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Here’s the syntax to write to a CSV file:

import csv
w=csv.writer(file(r'C:\greg.csv','wb'),dialect='excel')
some_values=[[1,2,3],['A','B','C'],[4,'"5"','ab,c']]
w.writerows(some_values)

Make sure you use ‘wb’ when you open the file. Otherwise I’ve found that it will put a blank line between each row at least when Excel opens it.

Here’s the syntax for reading a csv file (from the documentation):

import csv
reader = csv.reader(open("some.csv", "rb"))
for row in reader:
    print row[0], row[-1]

And here’s the link to the full documentation:
http://docs.python.org/lib/module-csv.html
And this takes you straight to the examples in the documentation.

Update:
Another useful writeup of the CSV module.

[tags]Python, csv, csv file, comma delimited, comma seperated values, comma seperated, Python documentation[/tags]