title: Python pyqt4 Key Shortcuts
body: <p>I am try to make a keyboard shortcut to exit the application after a Critical message pops up. i would like to make the user press the keyboard shortcut then be prompted with a Critical Message and after they click yes it will exit the program. ive been trying for a while now and couldnt get it to work. here is what i have </p>
  
  <p>here is my code</p>
  
  <pre><code>import sys
  import webbrowser
  import random
  import time
  import os
  import subprocess
  from PyQt4.QtCore import QSize, QTimer
  from PyQt4.QtGui import QApplication, QMainWindow, QPushButton, QWidget, QIcon, QLabel, QPainter, QPixmap, QMessageBox, \
      QAction, QKeySequence
  
  
  def CloseSC(self):
      msg = QMessageBox()
      msg.setIcon(QMessageBox.Critical)
      msg.setText("This is a message box")
      msg.setInformativeText("This is additional information")
      msg.setWindowTitle("MessageBox demo")
      msg.setStandardButtons(QMessageBox.Ok | QMessageBox.Cancel)
  
  
  class MainWindow(QMainWindow, ):
      def __init__(self, parent=None):
          super(MainWindow, self).__init__(parent)
          self.setGeometry(50, 50, 400, 450)
          self.setFixedSize(400, 450)
          self.startUIWindow()
  
          self.actionExit = QAction(('E&amp;xit'), self)
          self.actionExit.setShortcut(QKeySequence("Ctrl+Q"))
          self.actionExit.triggered.connect(CloseSC)
  </code></pre>