Python for tagging in CSV

csv.py

# assign variable to a csv file read by csv.reader
csvFile = csv.reader(open('/Users/Zach/Desktop/survey.csv', 'rb'), delimiter=',')

# identify header row
header = next(csvFile)

# loop rows in csv file, and identify variables for fields
for row in csvFile:
	if row[20] < 0:
		continue
	devStatus = row[4]
	commercial = row[8]
	industry = row[10]
	usage = row[12]
	address = row[14]
	comment = row[20]

        print comment

>>> 
comment
comment
ine 25, in <module>
    comment = row[20]
IndexError: list index out of range