How to use the labelme.__appname__ function in labelme

output_file = None
    output_dir = None
    if output is not None:
        if output.endswith('.json'):
            output_file = output
        else:
            output_dir = output

    translator = QtCore.QTranslator()
    translator.load(
        QtCore.QLocale.system().name(),
        osp.dirname(osp.abspath(__file__)) + '/translate'
    )
    app = QtWidgets.QApplication(sys.argv)
    app.setApplicationName(__appname__)
    app.setWindowIcon(newIcon('icon'))
    app.installTranslator(translator)
    win = MainWindow(
        config=config,
        filename=filename,
        output_file=output_file,
        output_dir=output_dir,
    )

    if reset_config:
        logger.info('Resetting Qt config: %s' % win.settings.fileName())
        win.settings.clear()
        sys.exit(0)

    win.show()
    win.raise_()

parser.add_argument(
        '--keep-prev',
        action='store_true',
        help='keep annotation of previous frame',
        default=argparse.SUPPRESS,
    )
    parser.add_argument(
        '--epsilon',
        type=float,
        help='epsilon to find nearest vertex on canvas',
        default=argparse.SUPPRESS,
    )
    args = parser.parse_args()

    if args.version:
        print('{0} {1}'.format(__appname__, __version__))
        sys.exit(0)

    logger.setLevel(getattr(logging, args.logger_level.upper()))

    if hasattr(args, 'flags'):
        if os.path.isfile(args.flags):
            with codecs.open(args.flags, 'r', encoding='utf-8') as f:
                args.flags = [l.strip() for l in f if l.strip()]
        else:
            args.flags = [l for l in args.flags.split(',') if l]

    if hasattr(args, 'labels'):
        if os.path.isfile(args.labels):
            with codecs.open(args.labels, 'r', encoding='utf-8') as f:
                args.labels = [l.strip() for l in f if l.strip()]
        else:

output_dir=None,
    ):
        if output is not None:
            logger.warning(
                'argument output is deprecated, use output_file instead'
            )
            if output_file is None:
                output_file = output

        # see labelme/config/default_config.yaml for valid configuration
        if config is None:
            config = get_config()
        self._config = config

        super(MainWindow, self).__init__()
        self.setWindowTitle(__appname__)

        # Whether we need to save or not.
        self.dirty = False

        self._noSelectionSlot = False

        # Main widgets and related state.
        self.labelDialog = LabelDialog(
            parent=self,
            labels=self._config['labels'],
            sort_labels=self._config['sort_labels'],
            show_text_field=self._config['show_label_text_field'],
            completion=self._config['label_completion'],
            fit_to_content=self._config['fit_to_content'],
            flags=self._config['label_flags']
        )

def setClean(self):
        self.dirty = False
        self.actions.save.setEnabled(False)
        self.actions.createMode.setEnabled(True)
        self.actions.createRectangleMode.setEnabled(True)
        self.actions.createCircleMode.setEnabled(True)
        self.actions.createLineMode.setEnabled(True)
        self.actions.createPointMode.setEnabled(True)
        self.actions.createLineStripMode.setEnabled(True)
        title = __appname__
        if self.filename is not None:
            title = '{} - {}'.format(title, self.filename)
        self.setWindowTitle(title)

        if self.hasLabelFile():
            self.actions.deleteFile.setEnabled(True)
        else:
            self.actions.deleteFile.setEnabled(False)

def saveFileDialog(self):
        caption = self.tr('%s - Choose File') % __appname__
        filters = self.tr('Label files (*%s)') % LabelFile.suffix
        if self.output_dir:
            dlg = QtWidgets.QFileDialog(
                self, caption, self.output_dir, filters
            )
        else:
            dlg = QtWidgets.QFileDialog(
                self, caption, self.currentPath(), filters
            )
        dlg.setDefaultSuffix(LabelFile.suffix[1:])
        dlg.setAcceptMode(QtWidgets.QFileDialog.AcceptSave)
        dlg.setOption(QtWidgets.QFileDialog.DontConfirmOverwrite, False)
        dlg.setOption(QtWidgets.QFileDialog.DontUseNativeDialog, False)
        basename = osp.basename(osp.splitext(self.filename)[0])
        if self.output_dir:
            default_labelfile_name = osp.join(

def setDirty(self):
        if self._config['auto_save'] or self.actions.saveAuto.isChecked():
            label_file = osp.splitext(self.imagePath)[0] + '.json'
            if self.output_dir:
                label_file_without_path = osp.basename(label_file)
                label_file = osp.join(self.output_dir, label_file_without_path)
            self.saveLabels(label_file)
            return
        self.dirty = True
        self.actions.save.setEnabled(True)
        self.actions.undo.setEnabled(self.canvas.isShapeRestorable)
        title = __appname__
        if self.filename is not None:
            title = '{} - {}*'.format(title, self.filename)
        self.setWindowTitle(title)

deleteFile,
            None,
            createMode,
            editMode,
            copy,
            delete,
            undo,
            None,
            zoomIn,
            zoom,
            zoomOut,
            fitWindow,
            fitWidth,
        )

        self.statusBar().showMessage(self.tr('%s started.') % __appname__)
        self.statusBar().show()

        if output_file is not None and self._config['auto_save']:
            logger.warn(
                'If `auto_save` argument is True, `output_file` argument '
                'is ignored and output filename is automatically '
                'set as IMAGE_BASENAME.json.'
            )
        self.output_file = output_file
        self.output_dir = output_dir

        # Application state.
        self.image = QtGui.QImage()
        self.imagePath = None
        self.recentFiles = []
        self.maxRecent = 7