Python script that efficiently drops columns from a CSV file

csvio.py

import csv
import sys

START = 0
STOP = 1
STEP = 1

# adjust the constants and then use like this:
# cat CSV_FILE | python csvio.py | less -S

writer = csv.writer(sys.stdout)
for row in csv.reader(iter(sys.stdin.readline, '')):
    writer.writerow(row[START:STOP:STEP])