Bonjour, je bloque sur un problème je voudrais centrer cette fenetre au centre de l'écran , mais je n'y arrive pas, si quelqu'un pouvez-m'aider merci de votre aide

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class Ui_MainWindow(object):
 
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(641, 607)
        icon = QtGui.QIcon()
        icon.addPixmap(QtGui.QPixmap(_fromUtf8(":/Icones/GUI Icons/SOCRATES+Logo3.ico")), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        MainWindow.setWindowIcon(icon)
        self.centralWidget = QtGui.QWidget(MainWindow)
        self.centralWidget.setObjectName(_fromUtf8("centralWidget"))
        self.label_6 = QtGui.QLabel(self.centralWidget)
        self.label_6.setGeometry(QtCore.QRect(60, 310, 521, 20))
        self.label_6.setObjectName(_fromUtf8("label_6"))
        self.label_7 = QtGui.QLabel(self.centralWidget)
        self.label_7.setGeometry(QtCore.QRect(210, 420, 61, 21))
        self.label_7.setObjectName(_fromUtf8("label_7"))
        self.lineEdit = QtGui.QLineEdit(self.centralWidget)
        self.lineEdit.setGeometry(QtCore.QRect(270, 420, 113, 20))
        self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
        self.label_2 = QtGui.QLabel(self.centralWidget)
        self.label_2.setGeometry(QtCore.QRect(60, 250, 521, 20))
        font = QtGui.QFont()
        font.setPointSize(12)
        font.setWeight(75)
        font.setBold(True)
        self.label_2.setFont(font)
        self.label_2.setObjectName(_fromUtf8("label_2"))
        self.toolButton = QtGui.QToolButton(self.centralWidget)
        self.toolButton.setGeometry(QtCore.QRect(290, 480, 71, 19))
        self.toolButton.setObjectName(_fromUtf8("toolButton"))
        self.label_3 = QtGui.QLabel(self.centralWidget)
        self.label_3.setGeometry(QtCore.QRect(60, 280, 521, 20))
        self.label_3.setObjectName(_fromUtf8("label_3"))
        self.label_4 = QtGui.QLabel(self.centralWidget)
        self.label_4.setGeometry(QtCore.QRect(60, 340, 521, 20))
        self.label_4.setObjectName(_fromUtf8("label_4"))
        self.label_8 = QtGui.QLabel(self.centralWidget)
        self.label_8.setGeometry(QtCore.QRect(180, 450, 91, 21))
        self.label_8.setObjectName(_fromUtf8("label_8"))
        self.lineEdit_2 = QtGui.QLineEdit(self.centralWidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(270, 450, 113, 20))
        self.lineEdit_2.setEchoMode(QtGui.QLineEdit.Password)
        self.lineEdit_2.setObjectName(_fromUtf8("lineEdit_2"))
        self.label = QtGui.QLabel(self.centralWidget)
        self.label.setGeometry(QtCore.QRect(210, 10, 227, 227))
        self.label.setText(_fromUtf8(""))
        self.label.setPixmap(QtGui.QPixmap(_fromUtf8(":/Icones/GUI Icons/StartUpLogo2.bmp")))
        self.label.setObjectName(_fromUtf8("label"))
        MainWindow.setCentralWidget(self.centralWidget)
 
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
        QtCore.QObject.connect(self.toolButton, QtCore.SIGNAL("clicked()"), self.Identification)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
        MainWindow.setTabOrder(self.lineEdit, self.lineEdit_2)
        MainWindow.setTabOrder(self.lineEdit_2, self.toolButton)