Releasing reference to QWidget on closeEvent

[Julio César Gázquez]

Hello list.

I have been doing things like in the sample code below for years. 
Recently I found that using Ubuntu 20.04 package for PyQt5 results in a 
SIGSEGV. It works ok using Phil's wheel package, and also works ok using 
the distro package in older versions of Ubuntu.

Today, just before filing a bug report to Ubuntu, I found that adding a 
self.deleteLater() call the problem dissappeared.

So, ¿I should use deleteLater() and did the things wrong the last 8 
years, o it is really a bug in Ubuntu's package?

from PyQt5.QtWidgets import QWidget, QApplication

window = None

class MyWindow(QWidget):

     def closeEvent(self, event):

         global window
         # SIGSEGV if set window to None
         window = None
         event.accept()
         

app = QApplication([])
window = MyWindow()
window.show()
app.exec_()


TIA.

Julio.