downloader.add_option('-R', '--retries',
dest='retries', metavar='RETRIES', help='number of retries (default is %default)', default=10)
downloader.add_option('--buffer-size',
downloader.add_option('-R', '--retries',
dest='retries', metavar='RETRIES', help='number of retries (default is %default)', default=10)
downloader.add_option('--buffer-size',