Unable to close window and exit the program using pyqt5

The best description is here:

https://stackoverflow.com/questions/55400635/how-to-close-a-window-in-pyqt5-and-terminate-the-program-program-gets-stuck

I will summarize again, below in case there is no access to my stackoverflow question.

"I want to create a window in pyqt5 and then close it. For some reason the program does not exit after closing the window. It gets stuck. I have been reading several related posts but none give a clear answer.

I have already tried code such as "self.object.close()", "app.quit()", even "self.object.destroy()", but all work in the same way. The only thing that really closes the window is by clicking the x (close) at the window itself. But this is not the behavior I need. I would like to close the window using my code."

code attached