pyqt5 打开文件

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import sysimport osfrom PyQt5.QtCore import *from PyQt5.QtWidgets import *class Notepad(QMainWindow):    def __init__(self):        super().__init__()        self.initUI()    def initUI(self):        openAction = QAction('Open', self)        openAction.setShortcut('Ctrl+O')        openAction.setStatusTip('Open a file')        openAction.triggered.connect(self.openFile)        closeAction = QAction('Close', self)        closeAction.setShortcut('Ctrl+Q')        closeAction.setStatusTip('Close Notepad')        closeAction.triggered.connect(self.close)        menubar = self.menuBar()        fileMenu = menubar.addMenu('&File')        fileMenu.addAction(openAction)        fileMenu.addAction(closeAction)        self.textEdit = QTextEdit(self)        self.textEdit.setFocus()        self.textEdit.setReadOnly(True)        self.resize(700, 800)        self.setWindowTitle('Notepad')        self.setCentralWidget(self.textEdit)        self.show()    def openFile(self):        filename, _ = QFileDialog.getOpenFileName(self, 'Open File', os.getenv('HOME'))        fh = ''        if QFile.exists(filename):            fh = QFile(filename)        if not fh.open(QFile.ReadOnly):            QtGui.qApp.quit()        data = fh.readAll()        codec = QTextCodec.codecForUtfText(data)        unistr = codec.toUnicode(data)        tmp = ('Notepad: %s' % filename)        self.setWindowTitle(tmp)        self.textEdit.setText(unistr)def main():    app = QApplication(sys.argv)    notepad = Notepad()    sys.exit(app.exec_())if __name__ == '__main__':    main()
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