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import PyQt4.QtGui as QtGui 

class MyMainWindow(QtGui.QMainWindow):
     
    def __init__(self, parent=None):
        super(MyMainWindow, self).__init__(parent)
        self.menu_bar = self.menuBar()
        self.session_menu = self.menu_bar.addMenu("&Session")
 
        self.setStyleSheet("""
        *
        {
            background-color: blue;
        }
        """)
 
if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    main_window = MyMainWindow()
    main_window.show()
    app.exec_()