如何在QtextEdit上加载粘贴内容

from PyQt5.QtWidgets import QApplication, QMainWindow, QTextEdit
import sys

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.text_edit = QTextEdit(self)
        self.setCentralWidget(self.text_edit)

    def paste_content(self):
        clipboard = QApplication.clipboard()
        content = clipboard.text()
        self.text_edit.setText(content)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    window.paste_content()
    sys.exit(app.exec_())