PyQt5 calling gui from pyuic5 converted file or uic.loadUi - python-3.x

Question

Hi I am new to python (up to lecture 2 and half of MIT 6001 Introduction to Computer Science and Programming in Python) nevetheless I started playing with Gtk & Glade and PyQt5 and Designer.
following https://stackoverflow.com/a/54081597/9877065 I used pyuic5 to convert my prova.ui, Designer generated window and imported in the code below:
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from prova1 import Ui_MainWindow
class MyWindow(QMainWindow):
def __init__(self):
super().__init__()
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.ButtonQ.clicked.connect(self.QPushButtonQPressed)
self.ButtonA.clicked.connect(self.QPushButtonAPressed)
def QPushButtonQPressed(self):
# This is executed when the button is pressed
print('pppppppp exit from QQQQQQQQQQQQQQQQQQQQQQQQQQQQQ')
sys.exit()
def QPushButtonAPressed(self):
# This is executed when the button is pressed
print('exit from AAAAAAAAAAAAAAAAAAAAAAA')
sys.exit()
if __name__ == '__main__':
app = QApplication(sys.argv)
w = MyWindow()
w.show()
sys.exit(app.exec_())
but when I run it in terminal I got a :
File "./main.py", line 80, in <module>
w = MyWindow()
File "./main.py", line 38, in __init__
self.ButtonQ.clicked.connect(self.QPushButtonQPressed)
AttributeError: 'MyWindow' object has no attribute 'ButtonQ'
error !!!!
while using loaduic like:
import sys
from PyQt5 import QtWidgets, uic
class Ui(QtWidgets.QMainWindow):
def __init__(self):
super(Ui, self).__init__()
uic.loadUi('prova1.ui', self)
self.ButtonQ.clicked.connect(self.QPushButtonQPressed)
self.ButtonA.clicked.connect(self.QPushButtonAPressed)
self.show()
def QPushButtonQPressed(self):
# This is executed when the button is pressed
print('pppppppp exit from QQQQQQQQQQQQQQQQQQQQQQQQQQQQQ')
sys.exit()
def QPushButtonAPressed(self):
# This is executed when the button is pressed
print('exit from AAAAAAAAAAAAAAAAAAAAAAA')
sys.exit()
app = QtWidgets.QApplication(sys.argv)
window = Ui()
app.exec_()
the program works as expected, that is show the window gui and exit if A or Quit button is pressed
as per the prova1.ui file that converted with pyuic5 gives, prova1.py:
# Form implementation generated from reading ui file 'prova1.ui'
#
# Created by: PyQt5 UI code generator 5.12.3
#
# 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(256, 351)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setEnabled(True)
self.centralwidget.setObjectName("centralwidget")
self.gridLayoutWidget = QtWidgets.QWidget(self.centralwidget)
self.gridLayoutWidget.setGeometry(QtCore.QRect(10, 0, 221, 261))
self.gridLayoutWidget.setObjectName("gridLayoutWidget")
self.gridLayout = QtWidgets.QGridLayout(self.gridLayoutWidget)
self.gridLayout.setContentsMargins(0, 0, 0, 0)
self.gridLayout.setObjectName("gridLayout")
self.ButtonA = QtWidgets.QPushButton(self.gridLayoutWidget)
font = QtGui.QFont()
font.setFamily("Abyssinica SIL")
font.setItalic(True)
font.setUnderline(True)
font.setStrikeOut(False)
font.setKerning(False)
self.ButtonA.setFont(font)
self.ButtonA.setCheckable(True)
self.ButtonA.setAutoDefault(False)
self.ButtonA.setDefault(False)
self.ButtonA.setObjectName("ButtonA")
self.gridLayout.addWidget(self.ButtonA, 0, 0, 1, 1)
self.C = QtWidgets.QPushButton(self.gridLayoutWidget)
self.C.setObjectName("C")
self.gridLayout.addWidget(self.C, 2, 0, 1, 1)
self.B = QtWidgets.QPushButton(self.gridLayoutWidget)
self.B.setObjectName("B")
self.gridLayout.addWidget(self.B, 1, 0, 1, 1)
self.ButtonQ = QtWidgets.QPushButton(self.gridLayoutWidget)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.ButtonQ.setFont(font)
self.ButtonQ.setCheckable(True)
self.ButtonQ.setAutoDefault(False)
self.ButtonQ.setDefault(False)
self.ButtonQ.setObjectName("ButtonQ")
self.gridLayout.addWidget(self.ButtonQ, 3, 0, 1, 1)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 256, 29))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.statusbar.setFont(font)
self.statusbar.setAutoFillBackground(True)
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.ButtonA.setText(_translate("MainWindow", "A"))
self.C.setText(_translate("MainWindow", "C"))
self.B.setText(_translate("MainWindow", "B"))
self.ButtonQ.setText(_translate("MainWindow", "Q quit"))
I am sure the error is somehow related to the class definitions but cannot really grasp it ? Any help ?

Answer 1

Heike solved it
In the first version of MyWindow, ButonA and ButtonQ are attributes of self.ui, not of self itself, so you need to use somthing like self.ui.ButtonA.clicked.connect(...), etc.