如何将QPlainTextEdit向右对齐？

from PyQt5.QtWidgets import QApplication, QMainWindow, QPlainTextEdit, QVBoxLayout, QWidget
from PyQt5.QtCore import Qt

if __name__ == '__main__':
    app = QApplication([])
    window = QMainWindow()
    central_widget = QWidget()
    layout = QVBoxLayout(central_widget)
    
    text_edit = QPlainTextEdit()
    text_edit.setPlainText("Hello World!")
    text_edit.setAlignment(Qt.AlignRight)
    
    layout.addWidget(text_edit)
    window.setCentralWidget(central_widget)
    window.show()
    
    app.exec_()