Функция сохранения файла save

    f = save(fname[0], 'w')

 def save(self):
 
        openFile = QAction(QIcon('icon.png'), '&Save', self)
        openFile.setShortcut('Ctrl+N')
        openFile.triggered.connect(self.saveDialog)
 
        self.toolbar = self.addToolBar('Save')
        self.toolbar.addAction(openFile)
 
    def saveDialog(self):
        fname = QFileDialog.getSaveFileName(self, 'Save', '/home/i_am')
        if fname[0]:
            f = save(fname[0], 'w')
            with f:
                data = f.write()
                self.textEdit.setText(data)

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QInputDialog, QLineEdit, QFileDialog
from PyQt5.QtGui import QIcon
 
class App(QWidget):
 
    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 file dialogs - pythonspot.com'
        self.left = 10
        self.top = 10
        self.width = 640
        self.height = 480
        self.initUI()
 
    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
 
        self.openFileNameDialog()
        self.openFileNamesDialog()
        self.saveFileDialog()
 
        self.show()
 
    def openFileNameDialog(self):    
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        fileName, _ = QFileDialog.getOpenFileName(self,"QFileDialog.getOpenFileName()", "","All Files (*);;Python Files (*.py)", options=options)
        if fileName:
            print(fileName)
 
    def openFileNamesDialog(self):    
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        files, _ = QFileDialog.getOpenFileNames(self,"QFileDialog.getOpenFileNames()", "","All Files (*);;Python Files (*.py)", options=options)
        if files:
            print(files)
 
    def saveFileDialog(self):    
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        fileName, _ = QFileDialog.getSaveFileName(self,"QFileDialog.getSaveFileName()","","All Files (*);;Text Files (*.txt)", options=options)
        if fileName:
            print(fileName)
 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())