PyQt5--MainWindow

 # -*- coding:utf-8 -*-
 '''
 Created on Sep 14, 2018

 @author: SaShuangYiBing
 '''
 import sys
 from PyQt5.QtWidgets import QApplication,QMainWindow,QTextEdit,QAction
 from PyQt5.QtGui import QIcon

 class New_test(QMainWindow):
     def __init__(self):
         super().__init__()
         self.initUI()

     def initUI(self):
         textEdit = QTextEdit()
         self.setCentralWidget(textEdit)

         exitAction = QAction(QIcon('tools.png'),'Exit',self)
         exitAction.setShortcut('Ctrl+Q')
         exitAction.triggered.connect(self.close)

         self.statusBar()

         menuBar = self.menuBar()
         fileMenu = menuBar.addMenu('&File')
         fileMenu.addAction(exitAction)

         toolBar = self.addToolBar('Exit')
         toolBar.addAction(exitAction)

         self.setGeometry(300,300,250,150)
         self.setWindowTitle('Main Window')
         self.show()

 if __name__ == "__main__":
     app = QApplication(sys.argv)
     ex = New_test()
     sys.exit(app.exec_())