AttributeError: 'MyMainWindow' object has no attribute 'pushButton'

Question

Trying to proceed click button event in my code but got some issue.

AttributeError: 'MyMainWindow' object has no attribute 'pushButton'

Seems, like clicked event can`t find pushbutton from my subclass. Probably i did some mistakes in syntax, so really waiting for your help guys. Sorry if the question very banal, pyQt5 is simply new for me, trying to figure out in all of this.

Here is my files.

ui_main.py

    # -*- coding: utf-8 -*-

# Form implementation generated from reading ui file '1.ui'
#
# Created by: PyQt5 UI code generator 5.7.1
#
# 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(349, 131)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.formLayout = QtWidgets.QFormLayout()
        self.formLayout.setObjectName("formLayout")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setAlignment(QtCore.Qt.AlignHCenter|QtCore.Qt.AlignTop)
        self.lineEdit.setObjectName("lineEdit")
        self.formLayout.setWidget(1, QtWidgets.QFormLayout.SpanningRole, self.lineEdit)
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.formLayout.setWidget(0, QtWidgets.QFormLayout.SpanningRole, self.label)
        self.gridLayout.addLayout(self.formLayout, 0, 0, 1, 1)
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout.addWidget(self.pushButton)
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setObjectName("pushButton_2")
        self.horizontalLayout.addWidget(self.pushButton_2)
        self.gridLayout.addLayout(self.horizontalLayout, 1, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 349, 21))
        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.label.setText(_translate("MainWindow", "TextLabel"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))
        self.pushButton_2.setText(_translate("MainWindow", "PushButton"))


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_())

py_main.py

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, qApp
from PyQt5.QtCore import Qt, QEvent, QObject
from ui_main import Ui_MainWindow


class MyMainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MyMainWindow, self).__init__(parent)
        qApp.installEventFilter(self)
        self.pushButton.clicked.connect(self.clickButton()) #here is where the issue is occurs
        self.show()
        self.setupUi(self)

    def eventFilter(self, obj, event):
        if event.type() == QEvent.KeyPress:
            if event.key() == Qt.Key_Escape:
                self.close()
        return super(MyMainWindow, self).eventFilter(obj, event)

    def clickButton(self):
        sender = self.sender()
        self.statusbar().showMessage(sender.text() + ' was pressed')

if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = MyMainWindow()
    test = TestClass()
    sys.exit(app.exec_())

Waiting forward for your help!

Answer 1

it work for me

call the setupUI function first

self.setupUi(self)          
self.pushButton.clicked.connect(self.click_button)

tag QDialog and Ui_Dialog

main.py

MyMainWindow(QDialog, Ui_Dialog):

mainGui.py

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Dialog = QtWidgets.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

OUTPUT:

SOLVED: AttributeError Main object has no attribute pushButton

Answer 2

In your code there are 3 errors:

1. You must call the setupUI function first since the button is created here and then connect that button to the slot.
2. When the button is connected to the slot you just have to pass the slot name without parenthesis.
3. Change statusbar() to statusBar().

Code:

# ...
class MyMainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MyMainWindow, self).__init__(parent)
        qApp.installEventFilter(self)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.clickButton)
        self.show()
# ...
    def clickButton(self):
        sender = self.sender()
        self.statusBar().showMessage(sender.text() + ' was pressed')
# ...