How to use the qtawesome._resource function in QtAwesome

def __init__(self):
        super(IconBrowser, self).__init__()
        self.setMinimumSize(400, 300)
        self.setWindowTitle('QtAwesome Icon Browser')

        qtawesome._instance()
        fontMaps = qtawesome._resource['iconic'].charmap

        iconNames = []
        for fontCollection, fontData in fontMaps.items():
            for iconName in fontData:
                iconNames.append('%s.%s' % (fontCollection, iconName))

        self._filterTimer = QtCore.QTimer(self)
        self._filterTimer.setSingleShot(True)
        self._filterTimer.setInterval(AUTO_SEARCH_TIMEOUT)
        self._filterTimer.timeout.connect(self._updateFilter)

        model = IconModel(self.palette().color(QtGui.QPalette.Text))
        model.setStringList(sorted(iconNames))

        self._proxyModel = QtCore.QSortFilterProxyModel()
        self._proxyModel.setSourceModel(model)