Python have great tool, that removes all complexity of csv. And is it named csv, You would not guess, right?
>>> import csv
>>> spamReader = csv.reader(open('eggs.csv'), delimiter=' ', quotechar='|')
>>> for row in spamReader:
... print ', '.join(row)
Spam, Spam, Spam, Spam, Spam, Baked Beans Spam, Lovely Spam, Wonderful Spam
reading csv is simple, but be aware that spamReader is one use only, so if you have to go through data multiple times, just copy them in first pass, or create reader before each pass.
Writing is the same. Change 'reader' to 'writer', and you are ready to write down your data. using writerow() or writerows() .
For more info look at python docs. There is one more feature to discover. Dialects (csv can detect delimiter and quotechar automagicly) are nice, but not required to use csv.