Как вывести текст из txt файла в QPlainTextEdit Python/PyQt5?

def fileopen(self):
        home = expanduser("~")
        desktop = os.path.join(home, 'Desktop')
        file = QtWidgets.QFileDialog.getOpenFileName(parent=self, caption="- o p e n -",
                                                          directory=desktop,
                                                          filter="All (*);;Exes (*.txt )",
                                                          initialFilter="Exes (*.txt )")
        self.fileName = file[0] # *.jpq *.jpeg

self.le = QPlainTextEdit(self)
        self.le.setGeometry(QtCore.QRect(207, 45, 341, 354))
        self.le.setStyleSheet("""
                QPlainTextEdit {background-color: #000000;}
                QPlainTextEdit {background-color:#000000} QPlainTextEdit {color:#FFFFFF}
                QPlainTextEdit {
                border-style: outset;
                border-width: 1px;
                border-color: #FFFFFF;} """)