How a QMainWindow can open a dialog?

[panoss]

I have the following code which has two classes:
-Ui_dialog_in
-myWindow

What I 'm trying to achieve is:
-when myWindow opens, to open a Ui_dialog_in

What must I change - add?

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from PyQt6 import QtCore, QtGui, QtWidgets from PyQt6.QtWidgets import QMainWindow, QHBoxLayout, QWidget from PySide6.QtWidgets import QApplication   class Ui_dialog_in(object):     def setupUi(self, dialog_in):         dialog_in.setObjectName("dialog_in")         dialog_in.resize(400, 146)         self.verticalLayout_3 = QtWidgets.QVBoxLayout(dialog_in)         self.verticalLayout_3.setObjectName("verticalLayout_3")         self.verticalLayout_2 = QtWidgets.QVBoxLayout()         self.verticalLayout_2.setObjectName("verticalLayout_2")         self.verticalLayout = QtWidgets.QVBoxLayout()         self.verticalLayout.setObjectName("verticalLayout")         self.horizontalLayout_2 = QtWidgets.QHBoxLayout()         self.horizontalLayout_2.setObjectName("horizontalLayout_2")         self.titleLabel = QtWidgets.QLabel(dialog_in)         self.titleLabel.setObjectName("titleLabel")         self.horizontalLayout_2.addWidget(self.titleLabel)         self.titleEdit = QtWidgets.QLineEdit(dialog_in)         self.titleEdit.setObjectName("titleEdit")         self.horizontalLayout_2.addWidget(self.titleEdit)         self.horizontalLayout_2.setStretch(0, 1)         self.horizontalLayout_2.setStretch(1, 4)         self.verticalLayout.addLayout(self.horizontalLayout_2)         self.horizontalLayout_3 = QtWidgets.QHBoxLayout()         self.horizontalLayout_3.setObjectName("horizontalLayout_3")         self.authorLabel = QtWidgets.QLabel(dialog_in)         self.authorLabel.setObjectName("authorLabel")         self.horizontalLayout_3.addWidget(self.authorLabel)         self.authorNameCombo = QtWidgets.QComboBox(dialog_in)         self.authorNameCombo.setObjectName("authorNameCombo")         self.horizontalLayout_3.addWidget(self.authorNameCombo)         self.horizontalLayout_3.setStretch(0, 1)         self.horizontalLayout_3.setStretch(1, 4)         self.verticalLayout.addLayout(self.horizontalLayout_3)         spacerItem = QtWidgets.QSpacerItem(20, 40, QtWidgets.QSizePolicy.Policy.Minimum, QtWidgets.QSizePolicy.Policy.Expanding)         self.verticalLayout.addItem(spacerItem)         self.horizontalLayout = QtWidgets.QHBoxLayout()         self.horizontalLayout.setObjectName("horizontalLayout")         spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Policy.Expanding, QtWidgets.QSizePolicy.Policy.Minimum)         self.horizontalLayout.addItem(spacerItem1)         self.okButton = QtWidgets.QPushButton(dialog_in)         self.okButton.setObjectName("okButton")         self.horizontalLayout.addWidget(self.okButton)         self.pushButton = QtWidgets.QPushButton(dialog_in)         self.pushButton.setObjectName("pushButton")         self.horizontalLayout.addWidget(self.pushButton)         self.verticalLayout.addLayout(self.horizontalLayout)         self.verticalLayout_2.addLayout(self.verticalLayout)         self.verticalLayout_3.addLayout(self.verticalLayout_2)           self.retranslateUi(dialog_in)         QtCore.QMetaObject.connectSlotsByName(dialog_in)       def retranslateUi(self, dialog_in):         _translate = QtCore.QCoreApplication.translate         dialog_in.setWindowTitle(_translate("dialog_in", "Dialog"))         self.titleLabel.setText(_translate("dialog_in", "Title"))         self.authorLabel.setText(_translate("dialog_in", "Author"))         self.okButton.setText(_translate("dialog_in", "PushButton"))         self.pushButton.setText(_translate("dialog_in", "PushButton"))       class myWindow(QMainWindow):     """A window to show the books available"""     def __init__(self, parent=None):         """Initializer."""         super().__init__(parent)         self.setWindowTitle("My title")         self.resize(550, 250)         self.centralWidget = QWidget()         self.setCentralWidget(self.centralWidget)         self.layout = QHBoxLayout()         self.centralWidget.setLayout(self.layout)         #self.setupUI()         # open second window, myDialog         myDialog = Ui_dialog_in()     if __name__ == "__main__":     app = QApplication([])     import sys     window = myWindow()     window.resize(800, 600)     window.show()     sys.exit(app.exec())

[Axel_Erfurt]

You have mixed PyQt6 and PySide6

A simple Dialog Example

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import sys   from PyQt6.QtWidgets import QApplication, QDialog, QMainWindow, QPushButton     class MainWindow(QMainWindow):     def __init__(self):         super().__init__()           self.setWindowTitle("App")           button = QPushButton("Click me")         button.clicked.connect(self.button_clicked)         self.setCentralWidget(button)       def button_clicked(self, s):         print("click", s)           dlg = QDialog(self)         dlg.setWindowTitle("Hallo!")         dlg.exec()     app = QApplication(sys.argv)   window = MainWindow() window.show()   app.exec()

[panoss]

It was so simple, this is embarashing .

What if I want the second form to derive from 'object'? 'class Ui_dialog_in(object):'
(because this is what is produced by pyuic6)

[Axel_Erfurt]

Use a window, and if you want to learn something don't use the designer.

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from PyQt6 import QtCore, QtGui, QtWidgets from PyQt6.QtWidgets import (QMainWindow, QHBoxLayout,                              QWidget, QApplication, QPushButton)    class Ui_dialog_in(QMainWindow):     def __init__(self, parent = None):         super(Ui_dialog_in, self).__init__(parent)               def setupUi(self, parent=None):         self.setObjectName("self")         self.resize(400, 146)         self.verticalLayout_3 = QtWidgets.QVBoxLayout()         self.verticalLayout_3.setObjectName("verticalLayout_3")         self.verticalLayout_2 = QtWidgets.QVBoxLayout()         self.verticalLayout_2.setObjectName("verticalLayout_2")         self.verticalLayout = QtWidgets.QVBoxLayout()         self.verticalLayout.setObjectName("verticalLayout")         self.horizontalLayout_2 = QtWidgets.QHBoxLayout()         self.horizontalLayout_2.setObjectName("horizontalLayout_2")         self.titleLabel = QtWidgets.QLabel(self)         self.titleLabel.setObjectName("titleLabel")         self.horizontalLayout_2.addWidget(self.titleLabel)         self.titleEdit = QtWidgets.QLineEdit(self)         self.titleEdit.setObjectName("titleEdit")         self.horizontalLayout_2.addWidget(self.titleEdit)         self.horizontalLayout_2.setStretch(0, 1)         self.horizontalLayout_2.setStretch(1, 4)         self.verticalLayout.addLayout(self.horizontalLayout_2)         self.horizontalLayout_3 = QtWidgets.QHBoxLayout()         self.horizontalLayout_3.setObjectName("horizontalLayout_3")         self.authorLabel = QtWidgets.QLabel(self)         self.authorLabel.setObjectName("authorLabel")         self.horizontalLayout_3.addWidget(self.authorLabel)         self.authorNameCombo = QtWidgets.QComboBox(self)         self.authorNameCombo.setObjectName("authorNameCombo")         self.horizontalLayout_3.addWidget(self.authorNameCombo)         self.horizontalLayout_3.setStretch(0, 1)         self.horizontalLayout_3.setStretch(1, 4)         self.verticalLayout.addLayout(self.horizontalLayout_3)         spacerItem = QtWidgets.QSpacerItem(20, 40, QtWidgets.QSizePolicy.Policy.Minimum, QtWidgets.QSizePolicy.Policy.Expanding)         self.verticalLayout.addItem(spacerItem)         self.horizontalLayout = QtWidgets.QHBoxLayout()         self.horizontalLayout.setObjectName("horizontalLayout")         spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Policy.Expanding, QtWidgets.QSizePolicy.Policy.Minimum)         self.horizontalLayout.addItem(spacerItem1)         self.okButton = QtWidgets.QPushButton(self)         self.okButton.setObjectName("okButton")         self.horizontalLayout.addWidget(self.okButton)         self.pushButton = QtWidgets.QPushButton(self)         self.pushButton.setObjectName("pushButton")         self.horizontalLayout.addWidget(self.pushButton)         self.verticalLayout.addLayout(self.horizontalLayout)         self.verticalLayout_2.addLayout(self.verticalLayout)         self.verticalLayout_3.addLayout(self.verticalLayout_2)            self.retranslateUi(self)         QtCore.QMetaObject.connectSlotsByName(self)         central_widget = QWidget()         central_widget.setLayout(self.verticalLayout_3)         self.setCentralWidget(central_widget)         self.show()          def retranslateUi(self, dialog_in):         _translate = QtCore.QCoreApplication.translate         dialog_in.setWindowTitle(_translate("dialog_in", "Dialog"))         self.titleLabel.setText(_translate("dialog_in", "Title"))         self.authorLabel.setText(_translate("dialog_in", "Author"))         self.okButton.setText(_translate("dialog_in", "PushButton"))         self.pushButton.setText(_translate("dialog_in", "PushButton"))          class myWindow(QMainWindow):     def __init__(self, parent = None):         super(myWindow, self).__init__(parent)         self.setWindowTitle("App")         self.resize(550, 250)         self.central_widget = QWidget()         self.setCentralWidget(self.central_widget)         self.layout = QHBoxLayout()         button = QPushButton("Open WIndow")         button.clicked.connect(self.button_clicked)         self.layout.addWidget(button)         self.central_widget.setLayout(self.layout)        def button_clicked(self):         self.dlg = Ui_dialog_in()         self.dlg.setupUi()       if __name__ == "__main__":     app = QApplication([])     import sys     window = myWindow()     window.resize(200, 100)     window.show()     sys.exit(app.exec())

[panoss]

I found it, thanks!

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from PyQt6 import QtCore, QtGui, QtWidgets from PyQt6.QtWidgets import QMainWindow, QPushButton, QDialog, QApplication, QVBoxLayout from PyQt6.QtWidgets import QMainWindow, QHBoxLayout, QWidget from PyQt6.QtWidgets import QApplication         class myWindow(QMainWindow):     """A window to show the books available"""     def __init__(self, parent=None):         """Initializer."""         super().__init__(parent)         self.setWindowTitle("My title")         self.resize(550, 250)         self.centralWidget = QWidget()         self.setCentralWidget(self.centralWidget)         self.layout = QHBoxLayout()         self.centralWidget.setLayout(self.layout)         #self.setupUI()         # open second window, myDialog         button = QPushButton("Click me")         button.clicked.connect(self.button_clicked)         self.setCentralWidget(button)     def button_clicked(self):         myDialog = Dialog()         myDialog.exec()     class Ui_dialog_in(object):     def setupUi(self, dialog_in):         dialog_in.setObjectName("dialog_in")         dialog_in.resize(400, 146)         self.verticalLayout_3 = QtWidgets.QVBoxLayout(dialog_in)         self.verticalLayout_3.setObjectName("verticalLayout_3")         self.verticalLayout_2 = QtWidgets.QVBoxLayout()         self.verticalLayout_2.setObjectName("verticalLayout_2")         self.verticalLayout = QtWidgets.QVBoxLayout()         self.verticalLayout.setObjectName("verticalLayout")         self.horizontalLayout_2 = QtWidgets.QHBoxLayout()         self.horizontalLayout_2.setObjectName("horizontalLayout_2")         self.titleLabel = QtWidgets.QLabel(dialog_in)         self.titleLabel.setObjectName("titleLabel")         self.horizontalLayout_2.addWidget(self.titleLabel)         self.titleEdit = QtWidgets.QLineEdit(dialog_in)         self.titleEdit.setObjectName("titleEdit")         self.horizontalLayout_2.addWidget(self.titleEdit)         self.horizontalLayout_2.setStretch(0, 1)         self.horizontalLayout_2.setStretch(1, 4)         self.verticalLayout.addLayout(self.horizontalLayout_2)         self.horizontalLayout_3 = QtWidgets.QHBoxLayout()         self.horizontalLayout_3.setObjectName("horizontalLayout_3")         self.authorLabel = QtWidgets.QLabel(dialog_in)         self.authorLabel.setObjectName("authorLabel")         self.horizontalLayout_3.addWidget(self.authorLabel)         self.authorNameCombo = QtWidgets.QComboBox(dialog_in)         self.authorNameCombo.setObjectName("authorNameCombo")         self.horizontalLayout_3.addWidget(self.authorNameCombo)         self.horizontalLayout_3.setStretch(0, 1)         self.horizontalLayout_3.setStretch(1, 4)         self.verticalLayout.addLayout(self.horizontalLayout_3)         spacerItem = QtWidgets.QSpacerItem(20, 40, QtWidgets.QSizePolicy.Policy.Minimum,                                            QtWidgets.QSizePolicy.Policy.Expanding)         self.verticalLayout.addItem(spacerItem)         self.horizontalLayout = QtWidgets.QHBoxLayout()         self.horizontalLayout.setObjectName("horizontalLayout")         spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Policy.Expanding,                                             QtWidgets.QSizePolicy.Policy.Minimum)         self.horizontalLayout.addItem(spacerItem1)         self.okButton = QtWidgets.QPushButton(dialog_in)         self.okButton.setObjectName("okButton")         self.horizontalLayout.addWidget(self.okButton)         self.pushButton = QtWidgets.QPushButton(dialog_in)         self.pushButton.setObjectName("pushButton")         self.horizontalLayout.addWidget(self.pushButton)         self.verticalLayout.addLayout(self.horizontalLayout)         self.verticalLayout_2.addLayout(self.verticalLayout)         self.verticalLayout_3.addLayout(self.verticalLayout_2)           self.retranslateUi(dialog_in)         QtCore.QMetaObject.connectSlotsByName(dialog_in)       def retranslateUi(self, dialog_in):         _translate = QtCore.QCoreApplication.translate         dialog_in.setWindowTitle(_translate("dialog_in", "Dialog"))         self.titleLabel.setText(_translate("dialog_in", "Title"))         self.authorLabel.setText(_translate("dialog_in", "Author"))         self.okButton.setText(_translate("dialog_in", "PushButton"))         self.pushButton.setText(_translate("dialog_in", "PushButton"))   class Dialog(QDialog, Ui_dialog_in):     def __init__(self,parent=None):         QDialog.__init__(self,parent)         self.setupUi(self)   if __name__ == "__main__":     app = QApplication([])     import sys     window = myWindow()     window.resize(800, 600)     window.show()     sys.exit(app.exec())