Related to QMessageBox

[Sahej singh]

Respected sir,
Can you please help me to rectify the following error,
line 40, in close_application
    choice = QtGui.QMessageBox.question(self, 'Extract!' ,"Get into the
chopper?",QtGui.QMessageBox.Yes | QtGui.MessageBox.No)
AttributeError: 'module' object has no attribute 'MessageBox'
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