Python 使用PyQt5 完成选择文件或目录的对话框方法

import sysfrom PyQt5.QtWidgets import QMainWindow,QApplication,QTextEdit,QAction,QFileDialogfrom PyQt5.QtGui import QIconclass Example(QMainWindow):  def __init__(self):    super(Example, self).__init__()    self.initUI()  def initUI(self):    self.textEdit = QTextEdit()    self.setCentralWidget(self.textEdit)    self.statusBar()    openfile = QAction(QIcon(r'C:/Users/Administrator/PycharmProjects/QT/picture/文件.jpg'),'open',self)    openfile.setShortcut("Ctrl + 0")    openfile.setStatusTip('open new file')    openfile.triggered.connect(self.showDialog)    menubar = self.menuBar()    filemune = menubar.addMenu('$File')    filemune.addAction(openfile)    self.setGeometry(300,300,300,300)    self.setWindowTitle('FIEL dialog')    self.show()  def showDialog(self):    fname = QFileDialog.getOpenFileName(self,'open file', '/')    if fname[0]:      try:        f = open(fname[0], 'r')        with f:          data = f.read()          self.textEdit.setText(data)      except:        self.textEdit.setText("打开文件失败，可能是文件内型错误")if __name__ == "__main__":    app = QApplication(sys.argv)    ex = Example()    sys.exit(app.exec_())