Convert .CSV to VCF Python

convert.py

# -*- coding: utf-8 -*-
#python 3.x

import csv
import sys

#convert a "comma separated values" file to vcf contact cards. I used this to convert a list of student
#names and phone numbers into a vcf and save the trouble of adding one by one through phone

#USAGE:
#CSV_to_Vcards.py CSV_filename


def convert(somefile):
    #assuming file format : lastname,firstname,phonenumber,mail
    with open( somefile, 'r' ) as source:
        reader = csv.reader( source ) #reader now holds the whole data like ['lastname', 'firstname', 'phonenumber', 'mail']
        allvcf = open('ALL.vcf', 'w') 
        i = 0
        for row in reader:
            #write in individual vcf
           # vcf = open(row[1] + ' ' + row[0] + ".vcf", 'w')
           #  vcf.write( 'BEGIN:VCARD' + "\n")
           #  vcf.write( 'VERSION:2.1' + "\n")
           #  vcf.write( 'N:' + row[0] + ';' + row[1] + "\n")
           #  vcf.write( 'FN:' + row[1] + ' ' + row[0] + "\n") #rembemer that lastname first
           #  vcf.write( 'ORG:' + 'ATI' + "\n")
           #  vcf.write( 'TEL;CELL:' + row[2] + "\n")
           #  vcf.write( 'EMAIL:' + row[3] + "\n")
           #  vcf.write( 'END:VCARD' + "\n")
           #  vcf.write( "\n")
           #  vcf.close()

            #write in the "ALL.vcf" file.
            allvcf.write( 'BEGIN:VCARD' + "\n")
            allvcf.write( 'VERSION:2.1' + "\n")
            allvcf.write( 'N:' + row[0] + ';' + row[1] + "\n")
            allvcf.write( 'FN:' + "Bootcamp " + row[1] + ' ' + row[0] + "\n") #remember that lastname first
            allvcf.write( 'ORG:' + 'Bootcamp' + "\n")
            allvcf.write( 'TEL;CELL:' + row[2] + "\n")
            allvcf.write( 'EMAIL:' + row[3] + "\n")
            allvcf.write( 'END:VCARD' + "\n")
            allvcf.write( "\n")

            i += 1#counts

        allvcf.close()
        print (str(i) + " vcf cards generated")


def main(args):
    if len(args) != 2:
        print ( "Usage:")
        print ( args[0] + " filename")
        return

    convert(args[1])

if __name__ == '__main__':
    main(sys.argv)

Could you please elaborate your script?