convert csv file to json using python

csvToJson.py

from optparse import OptionParser
import csv
import json

if __name__ == "__main__":

    parser = OptionParser(usage="usage: %prog csvfile")
    parser.add_option("-d", "--delimiter", type="string", dest="delimiter",
                      default=",", help="the delimiter, default is ','")
    (options, args) = parser.parse_args()
    if(len(args) != 1):
        parser.print_help()
        exit()

    print json.dumps([record for record in csv.DictReader(open(args[0], "r"), delimiter=options.delimiter)])