How to use the qdarkstyle.load_stylesheet function in QDarkStyle

# 设置Windows底部任务栏图标
    if 'Windows' in platform.uname() :
        ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID('vn.trader')  
    
    # 初始化Qt应用对象
    app = QtGui.QApplication(sys.argv)
    app.setWindowIcon(QtGui.QIcon(ICON_FILENAME))
    app.setFont(BASIC_FONT)
    
    # 设置Qt的皮肤
    try:
        f = file(SETTING_FILENAME)
        setting = json.load(f)    
        if setting['darkStyle']:
            import qdarkstyle
            app.setStyleSheet(qdarkstyle.load_stylesheet(pyside=False))
        f.close()
    except:
        pass
    
    # 初始化主引擎和主窗口对象
    mainEngine = MainEngine()
    mainWindow = MainWindow(mainEngine, mainEngine.eventEngine)
    mainWindow.showMaximized()
    
    # 在主线程中启动Qt事件循环
    sys.exit(app.exec_())

def runCalendarEditor():
    """运行日历编辑器"""
    try:               # Python 2
        reload(sys)
        sys.setdefaultencoding('utf8')
    except NameError:  # Python 3
        pass
    app = QtWidgets.QApplication(sys.argv)
    app.setFont(QtGui.QFont(u'微软雅黑', 12))
    
    try:
        import qdarkstyle
        app.setStyleSheet(qdarkstyle.load_stylesheet(pyside=False))
    except:
        pass        
    
    manager = CalendarManager()
    manager.showMaximized()
    
    sys.exit(app.exec_())

ui.bt_menu_button_popup.addActions([
        ui.actionAction,
        ui.actionAction_C
    ])

    item = QtGui.QTableWidgetItem("Test")
    item.setCheckState(QtCore.Qt.Checked)
    ui.tableWidget.setItem(0, 0, item)
    window.setWindowTitle("QDarkStyle example")
    window.setWindowTitle("QDarkStyle example")

    # tabify dock widgets to show bug #6
    window.tabifyDockWidget(ui.dockWidget1, ui.dockWidget2)

    # setup stylesheet
    app.setStyleSheet(qdarkstyle.load_stylesheet(pyside=True))

    # auto quit after 2s when testing on travis-ci
    if "--travis" in sys.argv:
        QtCore.QTimer.singleShot(2000, app.exit)

    # run
    window.show()
    app.exec_()

self._pool = None
        # Load the gui from file
        self.app = app
        guiloader = QUiLoader()
        #print os.getcwd()
        f = QtCore.QFile("gui/mainwindow.ui")
        f.open(QtCore.QFile.ReadOnly)
        self.ui = guiloader.load(f)
        f.close()


        # STYLE
        # self.app.setStyle('Plastique')
        with open('gui/style.stylesheet', 'r') as f:
            style = f.read()
        app.setStyleSheet(qdarkstyle.load_stylesheet() + style)



        # INITIAL GLOBALS
        self.viewerprevioustab = -1
        self.timelineprevioustab = -1
        self.experiment = config.experiment()
        self.folderwatcher = watcher.newfilewatcher()
        self.plugins = []




        # ACTIONS
        # Wire up action buttons
        self.ui.findChild(QtGui.QAction, 'actionOpen').triggered.connect(self.dialogopen)

])
    ui.bt_menu_button_popup.addActions([
        ui.actionAction,
        ui.actionAction_C
    ])
    item = QtGui.QTableWidgetItem("Test")
    item.setCheckState(QtCore.Qt.Checked)
    ui.tableWidget.setItem(0, 0, item)
    window.setWindowTitle("QDarkStyle example")
    window.setWindowTitle("QDarkStyle example")

    # tabify dock widgets to show bug #6
    window.tabifyDockWidget(ui.dockWidget1, ui.dockWidget2)

    # setup stylesheet
    app.setStyleSheet(qdarkstyle.load_stylesheet(pyside=False))

    # auto quit after 2s when testing on travis-ci
    if "--travis" in sys.argv:
        QtCore.QTimer.singleShot(2000, app.exit)

    # run
    window.show()
    app.exec_()

def applySettings(self):
        if Settings().globalStyle == 'white':
            QtWidgets.QApplication.instance().setStyleSheet("")
            self.frameRecents.setStyleSheet(home.frame_recent_white)
            self.labelRecents.setStyleSheet(home.label_recent_white)
            self.listWidgetRecents.setStyleSheet(home.list_recent_white)
        else:
            self.frameRecents.setStyleSheet(home.frame_recent_dark)
            self.labelRecents.setStyleSheet(home.label_recent_dark)
            self.listWidgetRecents.setStyleSheet(home.list_recent_dark)
            if '5' in os.environ['QT_API']:
                QtWidgets.QApplication.instance().setStyleSheet(
                    qdarkstyle.load_stylesheet_pyqt5())
            else:
                QtWidgets.QApplication.instance().setStyleSheet(
                    qdarkstyle.load_stylesheet(pyside=False))
        self.statusbar.setVisible(Settings().displayStatusBar)
        for i in range(self.tabWidgetEditors.count()):
            self.tabWidgetEditors.widget(i).updateSettings()
        self.setupIcons()
        self.menuBar.setVisible(Settings().displayMenuBar)
        if self.stackedWidget.currentIndex():
            self.toolBarCode.setVisible(Settings().displayToolBar)
            self.toolBarFile.setVisible(Settings().displayToolBar)
        self.lblFormat.setText('Free format' if Settings().free_format else 'Fixed format')

def setupStyle(self, s):
        if s.global_style == constants.DARK_STYLE:
            QtWidgets.QApplication.instance().setStyleSheet(
                qdarkstyle.load_stylesheet(pyside=False))
        self.setupIcons()

def __init__(self, *args, **kwargs):
        with open('xicam/gui/style.stylesheet', 'r') as f:
            style = f.read()
        style = (qdarkstyle.load_stylesheet() + style)

        kernel_manager = QtInProcessKernelManager()
        kernel_manager.start_kernel()
        kernel = kernel_manager.kernel
        kernel.gui = 'qt4'
        kernel.shell.push(dict(plugins.plugins))

        kernel_client = kernel_manager.client()
        kernel_client.start_channels()

        def stop():
            kernel_client.stop_channels()
            kernel_manager.shutdown_kernel()


        control = RichJupyterWidget()

args.win_size = int(args.win_size / 4.0) * 4  # make sure the width of the image can be divided by 4

    # initialize model and constrained optimization problem
    model_class = locate('model_def.%s' % args.model_type)
    model = model_class.Model(model_name=args.model_name, model_file=args.model_file)
    opt_class = locate('constrained_opt_%s' % args.framework)
    opt_solver = opt_class.OPT_Solver(model, batch_size=args.batch_size, d_weight=args.d_weight)
    img_size = opt_solver.get_image_size()
    opt_engine = constrained_opt.Constrained_OPT(opt_solver, batch_size=args.batch_size, n_iters=args.n_iters, topK=args.top_k,
                                                 morph_steps=args.morph_steps, interp=args.interp)

    # initialize application
    app = QApplication(sys.argv)
    window = gui_design.GUIDesign(opt_engine, win_size=args.win_size, img_size=img_size, topK=args.top_k,
                                  model_name=args.model_name, useAverage=args.average, shadow=args.shadow)
    app.setStyleSheet(qdarkstyle.load_stylesheet(pyside=False))  # comment this if you do not like dark stylesheet
    app.setWindowIcon(QIcon('pics/logo.png'))  # load logo
    window.setWindowTitle('Interactive GAN')
    window.setWindowFlags(window.windowFlags() & ~Qt.WindowMaximizeButtonHint)   # fix window siz
    window.show()
    app.exec_()

def on_styleActionGroup_triggered(self, action):
        """ Change current editor style """
        self.ui.genericEditor.currentStyle = styles.getStyle(action.text())
        stylesheet = ""
        if action.text() == "Dark":
            try:
                import qdarkstyle
                stylesheet = qdarkstyle.load_stylesheet()
            except ImportError:
                print "Failed to use the qdarkstyle. Please execute  to fully use this theme."
        QApplication.instance().setStyleSheet(stylesheet)