使用PyQt5在文本框内打印输出语句

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

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

    def initUI(self):
        self.textEdit = QTextEdit(self)
        self.setCentralWidget(self.textEdit)

        # 打印输出语句
        self.textEdit.append("Hello, World!")

        self.setGeometry(100, 100, 400, 300)
        self.setWindowTitle("Print Output in Text Box")
        self.show()

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