PyQt5 application not restarting itself

Fuchsiaff

So I followed this documentation
https://wiki.qt.io/How_to_make_an_Application_restartable

I need to make my software restart after doing some updates but it exists successfully but then doesn't start up anymore.

My code looks like this:

    def restart(self):

        qApp.exit(-123456789)

Note: The function is inside the Main class which inherits from QMainWindow

Kent-Dorfman

did you really follow that documentation? There is nothing magical about the exit code. you have to check it as a loop condition in main. I don't see enough of your code to know whether you did that.

Fuchsiaff

Since python does not have a do while loop, here's something I tried

if __name__ == '__main__':
    app = QApplication(sys.argv)
    current_exit_code = 0
    while True:
        ex = Main()
        ex.setFont(QFont("Consolas", 10))
        ex.setStyleSheet(blue)
        #welcome = Welcome(ex)
        ex.showMaximized()
        current_exit_code = app.exec()
        if current_exit_code == -123456789:
            break

That didn't work either

Fuchsiaff

Here's what I did to make it work:

 def restart(self):

        os.execl(sys.executable, sys.executable, *sys.argv)

That simple function will restart the whole script

Kent-Dorfman

reread the documentation you referenced above. You should instantiate QApplication inside your while loop, not outside.

JonB

@Fuchsiaff
That's fine, but it's a totally different kind of application "restart" versus what the code in the link is doing :)