Convert the .adr contact format (names and email only) of the Opera mail client into gmail-compatible CSV

opera_adr_to_csv.py

import sys

if len(sys.argv) != 3:
    print ("Usage: " + sys.argv[0] + " INPUT.ADR OUTPUT.CSV\n")
    print ("Convert the .adr contact format (names and email only) of the Opera mail client into gmail-compatible CSV.")
    sys.exit(1)

adrfile = open(sys.argv[1], 'r')
csvfile = open(sys.argv[2], 'w+')

header = 'Name,E-mail 1 - Value' + '\n'
csvfile.write(header)

def write_entry(name, mail):
    line = '"' + name + '",' + mail + '\n'
    csvfile.write(line)

current_name = None
for line in adrfile:
    line = line.strip()
    if line.startswith('NAME='):
        current_name = line[len('name='):]
    elif line.startswith('MAIL='):
        mail = line[len('MAIL='):]
        write_entry(current_name, mail)
        current_name = None

adrfile.close()
csvfile.close()