This post I made a while ago may help you. Here is the code contained in the Python node:
import sys
sys.path.append('C:\Program Files (x86)\IronPython 2.7\Lib')
import csv
import StringIO
csv_in = IN[0]
output = []
source = StringIO.StringIO(csv_in)
csv_out = csv.reader(source, dialect=csv.excel)
OUT = [line for line in csv_out]