PyQt5 relation between windows, first won't close

Question

I started treading into Linux, python3 three weeks ago, and from the second week started to look at PyQt5 too.

There many tutorials and book, to me Qt documentation seems written in Klingon, so I am trying to follow

examples found on the web.

The last problem I am facing is: given:

test3.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Wed Apr  8 14:25:12 2020

@author: Pietro
"""

import sys
from PyQt5 import QtWidgets, uic
from PyQt5.QtCore import QTimer
import time

class Quitto(QtWidgets.QDialog):

    def quitbuttonboxquit(self):
        print('system exit')
        app.quit()          

    def quitbuttonboxnonquit(self):
        print('return to main')
        window.show()
        self.close()

    def __init__(self):
        super(Quitto, self).__init__()
        uic.loadUi('exitdialog3.ui', self)
        self.center()
        self.show()
        print('inside quitting2 ' *5)

        self.QuitbuttonBox.accepted.connect(self.quitbuttonboxquit)
        self.QuitbuttonBox.rejected.connect(self.quitbuttonboxnonquit)

        self.counter = 0
        self.timer = QTimer()
        self.timer.setInterval(1000)
        self.timer.timeout.connect(self.recurring_timer)
        self.timer.start() 

    def center(self):
        qr = self.frameGeometry()
        cp = QtWidgets.QDesktopWidget().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())

    def closeEvent(self, event): 
            event.ignore()

    def recurring_timer(self):
        self.counter +=1
        self.label2.setText("TTCounter: %d"  % self.counter)    

class Menu(QtWidgets.QMainWindow):

    def __init__(self): 
        super(Menu, self).__init__()
        uic.loadUi('main2.ui', self)
        self.ButtonQ.clicked.connect(self.qpushbuttonqpressed) 
        self.center()
        self.show() 

        self.counter = 0                      
        self.timer = QTimer()
        self.timer.setInterval(1000)
        self.timer.timeout.connect(self.recurring_timer)
        self.timer.start()

        self.ButtonA.clicked.connect(self.qpushbuttonapressed)          

    def center(self):
        qr = self.frameGeometry()
        cp = QtWidgets.QDesktopWidget().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())               

    def qpushbuttonqpressed(self): #This is executed when the button is pressed
        print('buttonQ pressed' *5)

    #    window.close()   # doens't work, wondow doesn't close

        window.hide()     # this one does, windows hide

        self.pippo=Quitto()
        self.pippo.show()            

    def qpushbuttonapressed(self): #This is executed when the button is pressed
        print('buttonA pressed' *5)
        self.oh_no()

    def closeEvent(self, event): #Your desired functionality here 
            event.ignore()

    def recurring_timer(self):
        self.counter +=1
        self.label2.setText("TTCounter: %d"  % self.counter)    

    def oh_no(self):
            time.sleep(5)                           



if __name__ == '__main__':            
    app = QtWidgets.QApplication(sys.argv)
    sshFile="coffee.qss"
    window=Menu()
    sys.exit(app.exec_())

and the two .ui files,

main2.ui



 MainWindow
 
  
   Qt::WindowModal
  
  
   
    0
    0
    544
    686
   
  
  
   MainWindow
  
  
   
    :/main/python.png
    :/main/python.png
    :/main/python.png
    :/main/python.png
    :/main/python.png
    :/main/python.png
    :/main/python.png
    :/main/python.png:/main/python.png
  
  
   QPushButton{
    background-color: #9de650;
}


QPushButton:hover{
    background-color: green;
}

QPushButton#ButtonQ{
    background-color: orange;
}


QPushButton#ButtonQ:hover{
    background-color: red;
}
  
  
   
    
     
      20
      0
      471
      71
     
    
    
     
      16
      75
      true
      true
     
    
    
     House-Buying-Menu
    
    
     Qt::AlignCenter
    
   
   
    
     
      170
      200
      151
      81
     
    
    
     
      20
      75
      true
     
    
    
     SLEEP 5
    
   
   
    
     
      170
      310
      151
      81
     
    
    
     
      20
      75
      true
     
    
    
     B
    
   
   
    
     
      170
      420
      151
      81
     
    
    
     
      20
      75
      true
     
    
    
     C
    
   
   
    
     
      170
      550
      151
      81
     
    
    
     
      20
      75
      true
     
    
    
     QUIT
    
   
   
    
     
      120
      80
      221
      91
     
    
    
     
      20
      75
      true
     
    
    
     
    
   
  
  
   
    
     0
     0
     544
     29

exitdialog3.ui



 Dialog
 
  
   Qt::WindowModal
  
  
   
    0
    0
    720
    655
   
  
  
   
    true
   
  
  
   Dialog
  
  
   
  
  
   
    
     80
     560
     341
     32
    
   
   
    
     18
     75
     true
    
   
   
    QPushButton{                 
    background-color: #17eb3e;
}



QPushButton:hover{                 
    background-color: red;
}



   
   
    Qt::Horizontal
   
   
    QDialogButtonBox::Cancel|QDialogButtonBox::Ok
   
  
  
   
    
     100
     140
     491
     341
    
   
   
    image: url(:/main/alert.png);
   
   
    
   
  
  
   
    
     210
     510
     271
     41
    
   
   
    
     18
     75
     false
     true
    
   
   
    QLabel { 
    color : red
 }
   
   
    Are you sure to Quit ?!?
   
  
  
   
    
     190
     40
     321
     101
    
   
   
    
     20
     75
     false
     true
    
   
   
    
   
  
 
 
  
 
 
  
   QuitbuttonBox
   accepted()
   Dialog
   accept()
   
    
     248
     254
    
    
     157
     274
    
   
  
  
   QuitbuttonBox
   rejected()
   Dialog
   reject()
   
    
     316
     260
    
    
     286
     274

I don't understand why pressing Quit on the first window doesn't close it despite

window.close() #line 80 of test3.py ?

and why if I cancel quitting on the second window and then re-quit from the first window the timer on the second window restarts from 0, while the first window that doesn't close doesn't stop its timer too and if I press 'sleep 5' on the first window that doesn't close, both first and second window timers stop for 5 seconds?

Is it something about the parent/child window relation? None of the .ui files says anything like Parent or Child? Is it something else? How could I make the first window timer stop (i.e. closing it for sure) while the second window is on

Alexander Chernin · Accepted Answer

Because the variable window hadn't been declared in the scope of the def:

def qpushbuttonqpressed(self): #This is executed when the button is pressed
    print('buttonQ pressed' *5)

    self.close() # this is correct

    self.pippo=Quitto()
    self.pippo.exec() # use exec() to display the dialog
    self.show() # When the dialog will be closed we show the window again

The same mistake is in Quitto.quitbuttonboxnonquit:

def quitbuttonboxnonquit(self):
    print('return to main')
    # window.show() just delete this row
    self.close()

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