我想使用窗口2打开窗口1，然后从窗口2打开窗口1。如何使用pyqt5在python中进行操作？

Question

我创建了一个登录页面，在我登录该窗口后，关闭并打开另一个窗口。但是，从第二个窗口中，我将无法通过按注销来打开登录窗口。这是我尝试过的：

应用了所有方法以不同的方式导入文件，但是没有用。

我尝试了此操作，但没有成功。

LoginContent.py代码：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_LoginWondow(object):
    def LoginContent(self):
        from LogoutContent import Ui_MainWindow
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_MainWindow()
        self.ui.setupUi_LogoutContent(self.window)
        self.window.show()
        LoginWondow.close()

    def setupUi_LoginContent(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(300, 300)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(110, 120, 75, 23))
        self.pushButton.setObjectName("pushButton")

        # Button Clicked #
        self.pushButton.clicked.connect(self.LoginContent)
        ######################


        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "Login"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    LoginWondow = QtWidgets.QMainWindow()
    ui = Ui_LoginWondow()
    ui.setupUi_LoginContent(LoginWondow)
    LoginWondow.show()
    sys.exit(app.exec_())

LogoutContent.py代码：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def LogoutContent(self):
        from LoginContent import Ui_LoginWondow
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_LoginWondow()
        self.ui.setupUi_LoginContent(self.window)
        self.window.show()
        MainWindow.close()


    def setupUi_LogoutContent(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(300, 300)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(100, 130, 75, 23))
        self.pushButton.setObjectName("pushButton")

        # Button Clicked #
        self.pushButton.clicked.connect(self.LogoutContent)
        ######################

        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "Logout"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

从LoginContent.py执行到LogoutContent.py，然后从LogoutContent.py返回到LoginContent.py，此错误消息显示：

Traceback (most recent call last):
  File "LogoutContent.py", line 18, in LogoutContent
    MainWindow.close()
NameError: name 'MainWindow' is not defined

这两个AdminMainWindow和LoginWindow已在最后定义。

在此先感谢