AttributeError: QDialog object has no attribute setCentralWidget

Question

I\'m trying to create a GUI with QT Designer. I\'ve converted my .ui designer file to a .py file using the following tutorial: http://pyqt.sourceforge.net/Docs/PyQt5/designe

Answer 1

When you use qt-designer you can choose the type of widget you want to design:

For example you have chosen a Main Window, therefore you must implement it with QMainWindow.

#
# Created by: PyQt5 UI code generator 5.7
#
# WARNING! All changes made in this file will be lost!
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow

class Ui_ImageDialog(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(160, 200, 191, 151))
        self.pushButton.setObjectName("pushButton")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(450, 200, 191, 151))
        self.pushButton_2.setObjectName("pushButton_2")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(150, 70, 501, 101))
        palette = QtGui.QPalette()
        brush = QtGui.QBrush(QtGui.QColor(255, 0, 255))
        brush.setStyle(QtCore.Qt.SolidPattern)
        palette.setBrush(QtGui.QPalette.Active, QtGui.QPalette.WindowText, brush)
        brush = QtGui.QBrush(QtGui.QColor(255, 0, 255))
        brush.setStyle(QtCore.Qt.SolidPattern)
        palette.setBrush(QtGui.QPalette.Inactive, QtGui.QPalette.WindowText, brush)
        brush = QtGui.QBrush(QtGui.QColor(127, 127, 127))
        brush.setStyle(QtCore.Qt.SolidPattern)
        palette.setBrush(QtGui.QPalette.Disabled, QtGui.QPalette.WindowText, brush)
        self.label.setPalette(palette)
        font = QtGui.QFont()
        font.setPointSize(72)
        self.label.setFont(font)
        self.label.setLayoutDirection(QtCore.Qt.LeftToRight)
        self.label.setObjectName("label")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 22))
        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", "Open Input File:"))
        self.pushButton_2.setText(_translate("MainWindow", "Run"))
        self.label.setText(_translate("MainWindow", "Happy Scraping"))

app = QApplication(sys.argv)
window = QMainWindow()

ui = Ui_ImageDialog()
ui.setupUi(window)

window.show()
sys.exit(app.exec_())

If you want to implement a QDialog you must choose some of the Dialog(Dialog with Buttons Bottom, Dialog with Buttons Right or Dialog without Buttons).