Qt and QtPy Edit window & argument 1 has unexpected type 'Ui_MainWindow' Error

[Athul]

I'm developing an application for my 3D printer. I only have basic knowledge in python(started three weeks ago for this purpose), so I decided using Qt Designer after referring some tutorials. In a tutorial (there he developed GUI using QtPy with out using designer), the tutor adds a button, upon clicking, it will pop-up a dialogue box asking confirmation. I tried to replicate it in my application. first I followed his coding

and here's the code

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import sys from PyQt5 import QtCore, QtGui, QtWidgets   class Window(QtWidgets.QMainWindow):           btn.clicked.connect(self.close_application)         btn.resize(btn.minimumSizeHint())         btn.move(0, 100)           self.show()       def __init__(self):         super(Window, self).__init__()         self.setGeometry(50, 50, 500, 300)         self.setWindowTitle("test")         self.setWindowIcon(QtGui.QIcon('clay.png'))               self.home()       def home(self):           #push button         btn = QtWidgets.QPushButton("Quit", self)       def close_application(self):           #message box         choice = QtWidgets.QMessageBox.question(self, "extract!", "get inside!!!",QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)           if choice == QtWidgets.QMessageBox.Yes:             print("extracting")             sys.exit()           else:             pass     def run():     app = QtWidgets.QApplication(sys.argv)       GUI = Window()     sys.exit(app.exec_())   run()

Then I tried to add it into the code developed by Qt designer,

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# -*- coding: utf-8 -*-   # Form implementation generated from reading ui file 'test.ui' # # Created by: PyQt5 UI code generator 5.9.2 # # WARNING! All changes made in this file will be lost!   from PyQt5 import QtCore, QtGui, QtWidgets   class Ui_MainWindow(object):     def setupUi(self, MainWindow):         MainWindow.setObjectName("MainWindow")         MainWindow.resize(800, 600)         self.centralwidget = QtWidgets.QWidget(MainWindow)         self.centralwidget.setObjectName("centralwidget")         self.pushButton = QtWidgets.QPushButton(self.centralwidget)         self.pushButton.setGeometry(QtCore.QRect(70, 90, 93, 28))         self.pushButton.setObjectName("pushButton")         MainWindow.setCentralWidget(self.centralwidget)         self.menubar = QtWidgets.QMenuBar(MainWindow)         self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))         self.menubar.setObjectName("menubar")         MainWindow.setMenuBar(self.menubar)         self.statusbar = QtWidgets.QStatusBar(MainWindow)         self.statusbar.setObjectName("statusbar")         MainWindow.setStatusBar(self.statusbar)           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", "PushButton"))         self.pushButton.clicked.connect(self.close_app)       def close_app(self):         #message box         choice = QtWidgets.QMessageBox.question(self, "Exit", "Are you sure?",QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)           if choice == QtWidgets.QMessageBox.Yes:             print("extracting")             sys.exit()           else:             pass     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_())

But it shows an error

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Traceback (most recent call last):   File "C:\Users\New User\Desktop\test\test - Copy.py", line 40, in close_app     choice = QtWidgets.QMessageBox.question(self, "Exit", "Are you sure?",QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No) TypeError: question(QWidget, str, str, buttons: Union[QMessageBox.StandardButtons, QMessageBox.StandardButton] = QMessageBox.StandardButtons(QMessageBox.Yes|QMessageBox.No), defaultButton: QMessageBox.StandardButton = QMessageBox.NoButton): argument 1 has unexpected type 'Ui_MainWindow'

I asked this question in stackoverflow and one guy told me the first parameter of question() is a widget and directed me to this link

i didn't understand most things I read there and after searching a lot I changed to this

1	class Ui_MainWindow(QtWidgets.QMainWindow):

and it started working. I don't what this change does. Can anyone explain this to me??

Also today I added a Edit window to the code

This from the tutorial I used

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import sys from PyQt5 import QtCore, QtGui, QtWidgets   class Window(QtWidgets.QMainWindow):       def __init__(self):         super(Window, self).__init__()         self.setGeometry(50, 50, 500, 300)         self.setWindowTitle("test")         self.setWindowIcon(QtGui.QIcon('clay.png'))           #options inside file menu                 openEditor = QtWidgets.QAction("&Editor", self)         openEditor.setShortcut("Ctrl+E")         openEditor.setStatusTip("Open Editor")         openEditor.triggered.connect(self.editor)         #status bar         self.statusBar()           #file menu         mainMenu = self.menuBar()                   editorMenu = mainMenu.addMenu("&Editor")         editorMenu.addAction(openEditor)             self.home()       def home(self):                     self.show()            def editor(self):         self.textEdit = QtWidgets.QTextEdit()         self.setCentralWidget(self.textEdit)           def run():     app = QtWidgets.QApplication(sys.argv)       GUI = Window()     sys.exit(app.exec_())   run()

and made changes to Qtdesigner code

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# -*- coding: utf-8 -*-   # Form implementation generated from reading ui file 'test.ui' # # Created by: PyQt5 UI code generator 5.9.2 # # WARNING! All changes made in this file will be lost!   from PyQt5 import QtCore, QtGui, QtWidgets   class Ui_MainWindow(QtWidgets.QMainWindow):     def setupUi(self, MainWindow):         MainWindow.setObjectName("MainWindow")         MainWindow.resize(800, 600)         self.centralwidget = QtWidgets.QWidget(MainWindow)         self.centralwidget.setObjectName("centralwidget")         self.pushButton = QtWidgets.QPushButton(self.centralwidget)         self.pushButton.setGeometry(QtCore.QRect(70, 90, 93, 28))         self.pushButton.setObjectName("pushButton")         MainWindow.setCentralWidget(self.centralwidget)         self.menubar = QtWidgets.QMenuBar(MainWindow)         self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))         self.menubar.setObjectName("menubar")         self.menuEdit = QtWidgets.QMenu(self.menubar)         self.menuEdit.setObjectName("menuEdit")         MainWindow.setMenuBar(self.menubar)         self.statusbar = QtWidgets.QStatusBar(MainWindow)         self.statusbar.setObjectName("statusbar")         MainWindow.setStatusBar(self.statusbar)         self.actionEditor = QtWidgets.QAction(MainWindow)         self.actionEditor.setObjectName("actionEditor")         self.menuEdit.addAction(self.actionEditor)         self.menubar.addAction(self.menuEdit.menuAction())           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", "PushButton"))         self.menuEdit.setTitle(_translate("MainWindow", "Edit"))         self.actionEditor.setText(_translate("MainWindow", "Editor"))         self.pushButton.clicked.connect(self.close_app)         self.actionEditor.triggered.connect(self.editor)       def editor(self):         self.textEdit = QtWidgets.QTextEdit()         self.setCentralWidget(self.textEdit)       def close_app(self):         #message box'         choice = QtWidgets.QMessageBox.question(self, "Exit", "Are you sure?",QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)           if choice == QtWidgets.QMessageBox.Yes:             print("extracting")             sys.exit()           else:             pass     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_())

But when I click Editor nothing opens?
Here also with out QtWidget.QMainWindow in Ui_MainWindow shows error??

This is the tutorial I'm following https://www.youtube.com/watch?v=4Mg6bw1MmAE

This is how my application looks like

[Axel_Erfurt]

1	MainWindow.setCentralWidget(self.centralwidget)

you already set the button as centralwidget

[Athul]

Thanks for the reply, But you have to explain that to me???? What does that mean?

[Axel_Erfurt]

There is too much wrong code...

Do you really need Qtdesigner? Better learn without it.

Take a look at my PlainTextEdit or RichTextEdit on github.

[Athul]

Most code is generated using PyQt and Qt5.
I only added

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self.pushButton.clicked.connect(self.close_app)         self.actionEditor.triggered.connect(self.editor)        def editor(self):         self.textEdit = QtWidgets.QTextEdit()         self.setCentralWidget(self.textEdit)        def close_app(self):         #message box'         choice = QtWidgets.QMessageBox.question(self, "Exit", "Are you sure?",QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)            if choice == QtWidgets.QMessageBox.Yes:             print("extracting")             sys.exit()            else:             pass

this part

[Alfalfa]

You should definetly use QtDesigner to make the UI. Not only it will look much better, it reduces the noise of your app logic. Here's an example where you can load the .ui file directly (if you don't intend to package the app in the future, you can simply remove the code about 'foo.gui_main'): https://gitlab.com/snippets/1743613

Then inside the Main() class, connect your buttons just like you did

1	self.pushButton.clicked.connect(self.close_app)

[Axel_Erfurt]

I do not understand your concept.
You place the button somewhere in the window where you want to have the text field later.
Then either the button or the text field is not visible.
Use a toolbar and place the button there.
Or place the button in the statusbar.

---

Do not use something like "Exit", "Are you sure?"

Users hate that.

better ask for saving changes.

here is a simple example, choose "New" from File Menu to show the Text Field

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from PyQt5.QtWidgets import (QWidget, QVBoxLayout, QApplication,                              QTextEdit, QAction, QMenu, QMainWindow) from PyQt5.QtGui import QIcon, QTextCursor, QKeySequence from PyQt5.QtCore import Qt import sys   class myEditor(QMainWindow):     def __init__(self, parent = None):         super(myEditor, self).__init__(parent)         self.editor = QTextEdit()         self.editor.setTabStopWidth(20)           bar=self.menuBar()         self.filemenu=bar.addMenu("File")         self.separatorAct = self.filemenu.addSeparator()         self.filemenu.addAction(QAction(QIcon.fromTheme('document-new'), "New", self, triggered = self.newAct, shortcut = "Ctrl+n"))         self.filemenu.addAction(QAction(QIcon.fromTheme('document-open'), "Open", self, triggered = self.openAct, shortcut = "Ctrl+o"))         self.filemenu.addAction(QAction(QIcon.fromTheme('document-save'), "Save", self, triggered = self.saveAct, shortcut = "Ctrl+s"))         self.filemenu.addAction(QAction(QIcon.fromTheme('document-save-as'), "Save as ...", self, triggered = self.saveAsAct, shortcut = "Shift+Ctrl+s"))         self.filemenu.addSeparator()         self.filemenu.addAction(QAction(QIcon.fromTheme('application-exit'), "Exit", self, triggered = self.exitAct, shortcut = "Ctrl+q"))                   editmenu = bar.addMenu("Edit")         editmenu.addAction(QAction(QIcon.fromTheme('edit-undo'), "Undo", self, triggered = self.editor.undo, shortcut = "Ctrl+u"))         editmenu.addAction(QAction(QIcon.fromTheme('edit-redo'), "Redo", self, triggered = self.editor.redo, shortcut = "Shift+Ctrl+u"))         editmenu.addSeparator()         editmenu.addAction(QAction(QIcon.fromTheme('edit-copy'), "Copy", self, triggered = self.editor.copy, shortcut = "Ctrl+c"))         editmenu.addAction(QAction(QIcon.fromTheme('edit-cut'), "Cut", self, triggered = self.editor.cut, shortcut = "Ctrl+x"))         editmenu.addAction(QAction(QIcon.fromTheme('edit-paste'), "Paste", self, triggered = self.editor.paste, shortcut = "Ctrl+v"))         editmenu.addAction(QAction(QIcon.fromTheme('edit-delete'), "Delete", self, triggered = self.editor.cut, shortcut = "Del"))         editmenu.addSeparator()         editmenu.addAction(QAction(QIcon.fromTheme('edit-select-all'), "Select All", self, triggered = self.editor.selectAll, shortcut = "Ctrl+a"))           self.layoutV = QVBoxLayout() #        self.layoutV.addWidget(self.editor)         mq = QWidget(self)         mq.setLayout(self.layoutV)         self.setCentralWidget(mq)           self.createStatusBar()       def createStatusBar(self):         self.statusBar().showMessage("Ready", 0)       def newAct(self):         self.layoutV.addWidget(self.editor)         self.statusBar().showMessage("TextEdit visible", 0)       def openAct(self):         return       def saveAct(self):         return       def saveAsAct(self):         return       def exitAct(self):         print("Goodbye ...")         app.quit()   if __name__ == '__main__':     app = QApplication(sys.argv)     win = myEditor() #    win.setWindowIcon(QIcon.fromTheme("gnome-mime-text-x-python"))     win.setWindowTitle("Editor")     win.setMinimumSize(640,250)     win.showMaximized()     app.exec_()