AttributeError: 'MainWindow' object has no attribute 'textEdit'

import sys
from PyQt5.QtWidgets import QMainWindow, QTextEdit, QAction, QApplication, qApp, QFileDialog, QTextEdit
from PyQt5.QtGui import QIcon
 
 
class MainWindow(QMainWindow):
 
    def __init__(self):
        super().__init__()
        self.copiedtext=""
        self.MainMenu()
 
 
    def MainMenu(self):
 
        textEdit=QTextEdit()
        self.setCentralWidget(textEdit)
 
        exitAction = QAction(QIcon('ico/exit.png'), 'Exit', self)
        exitAction.setShortcut('Ctrl+Q')
        exitAction.setStatusTip('Exit application')
        exitAction.triggered.connect(self.close)
 
        newAction=QAction(QIcon('ico\new document.png'),'New',self)
        newAction.setShortcut('Ctrl+N')
        newAction.setStatusTip('New Application')
        newAction.triggered.connect(self.__init__)
 
        openAction=QAction(QIcon('ico\open.png'),'Open',self)
        openAction.setShortcut('Ctrl+O')
        openAction.setStatusTip('Open Application')
        openAction.triggered.connect(self.openo)
 
        saveAction=QAction(QIcon('save.png'),'Save',self)
        saveAction.setShortcut('Ctrl+S')
        saveAction.setStatusTip('Save Application')
        saveAction.triggered.connect(self.save)
 
        undoAction=QAction(QIcon('undo.png'),'Undo',self)
        undoAction.setShortcut('Ctrl+Z')
        undoAction.setStatusTip('Undo')
        undoAction.triggered.connect(self.textEdit.undo)