raise error if not header found(csv files)

Question

Reading CSV files. I want to raise error message if there is no any header from following list. It must be atleast one header in csv file. Headers are age sex city. I'm trying like this. thanks

with open('data.csv') as f:
  cf = csv.DictReader(f, fieldnames=['city'])
  for row in cf:
    print row['city']

Answer 1

How about this?

import csv

with open('data.csv', 'rb') as inf:
    cf = csv.reader(inf)

    header = cf.next()
    if header != ['Age', 'Sex', 'City']:
        print "No header found"
    else:
        for row in cf:
            print row[2]