title: PyQt5 closeEvent method
body: <p>I'm currently learning how to build an application with pyqt5 and encountered some problem with closeEvent method, overriden so user gets asked for confirmation by QMessageBox object. It seems working well with X button - event gets 'accepted' when action is confirmed and 'canceled' when cancel button is clicked. However, when I use my Quit button from dropdown File menu, no matter which button I click, program gets closed with exit code 1. Seems strange, because I use same closeEvent method in both cases.</p>
  
  <pre><code>import sys
  
  from PyQt5.QtWidgets import QApplication, QMessageBox, QMainWindow, QAction
  
  
  class window(QMainWindow):
      def __init__(self):
  
          super().__init__()
  
      def createUI(self):
  
  
          self.setGeometry(500, 300, 700, 700)
  
          self.setWindowTitle("window")
  
  
          quit = QAction("Quit", self)
          quit.triggered.connect(self.closeEvent)
  
          menubar = self.menuBar()
          fmenu = menubar.addMenu("File")
          fmenu.addAction(quit)
  
      def closeEvent(self, event):
          close = QMessageBox()
          close.setText("You sure?")
          close.setStandardButtons(QMessageBox.Yes | QMessageBox.Cancel)
          close = close.exec()
  
          if close == QMessageBox.Yes:
              event.accept()
          else:
              event.ignore()
  
  main = QApplication(sys.argv)
  window = window()
  window.createUI()
  window.show()
  sys.exit(main.exec_())
  </code></pre>
  
  <p>Thanks for suggestions!</p>