我正在制作一個(gè)程序來(lái)檢查python中的adb設(shè)備我無(wú)法彈出窗口，請(qǐng)更正我的代碼。從PyQt4導(dǎo)入sys導(dǎo)入子進(jìn)程導(dǎo)入QtGui，QtCoread = subprocess.check_output（[“ adb”，“ devices”]）class Example(QtGui.QWidget):    def __init__(self):        super(Example, self).__init__()        self.initUI()    def initUI(self):        QtGui.QToolTip.setFont(QtGui.QFont('SansSerif', 10))        btn = QtGui.QPushButton('Check Device', checkadb(ad))        btn.resize(135, 30)        btn.move(50, 10)        self.setGeometry(250, 250, 400, 400)        self.setWindowTitle('Tooltips')        self.show()def clicked(*args):    QtGui.QMessageBox.about(QtGui, "No Device Found")def clicked2(*args):    QtGui.QMessageBox.about(QtGui, "Device Found")def checkadb(ad):    if len(ad) <= 27:        clicked()elif len(ad) > 27:    clicked2()def main():app = QtGui.QApplication(sys.argv)ex = Example()sys.exit(app.exec_())if __name__ == '__main__':    main()