convert csv files to a vcf (vcard) file

csv2vcf.py

#!/usr/bin/python3

import argparse, re, csv

parser = argparse.ArgumentParser(
    description='read csv files and print to stdout in vcf format',
    formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('-d', '--delimiter', type=str, default=',', 
    help='field delimiter character')
parser.add_argument('mapping',
    help='column => field name mapping, i.e. "FN: EMAIL:"')
parser.add_argument('csvfiles', nargs='*', help='csvf1 csvf2 ...')
args = parser.parse_args()

field_names = args.mapping.split()
for csvfn in args.csvfiles:
    with open(csvfn, newline='') as csvfile:
        for row in csv.reader(csvfile):
            print('BEGIN:VCARD\nVERSION:3.0')
            for i in range(len(field_names)):
                print(field_names[i]+row[i])
            print('END:VCARD\n')