How to use the svglib.svglib.__date__.find function in svglib

def cli_main():
    args = dict(
        prog=basename(sys.argv[0]),
        version=svglib.__version__,
        author=svglib.__author__,
        license=svglib.__license__,
        copyleft_year=svglib.__date__[:svglib.__date__.find('-')],
        ts_pattern="{{dirname}}/out-"\
                   "{{now.hour}}-{{now.minute}}-{{now.second}}-"\
                   "%(base)s",
    )
    if args['prog'].endswith('2ps'):
        args['ext'] = 'eps'
    elif args['prog'].endswith('2pdf'):
        args['ext'] = 'pdf'
    elif args['prog'].endswith('2pm'):
        args['ext'] = 'pm'
    args['ext_caps'] = args['ext'].upper()
    args['ts_pattern'] += ('.%s' % args['ext'])
    desc = '{prog} v. {version}\n'.format(**args)
    # import pdb; pdb.set_trace()
    desc += 'A converter from SVG to {} (via ReportLab Graphics)\n'.format(args['ext_caps'])
    if args['prog'].endswith('2pm'):