class MainWindow(QtWidgets.QMainWindow):

    def __init__(self):

        super(MainWindow, self).__init__()
        self.ui = Ui_MainWindow()

        self.setFixedSize(712, 432)

        icon = QtGui.QIcon()
        icon.addPixmap(QtGui.QPixmap("../static/icon.ico"), QtGui.QIcon.Selected, QtGui.QIcon.On)
        self.setWindowIcon(icon)