如何清除表格小部件pyqt5以添加新内容

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QTableWidget, QTableWidgetItem, QPushButton

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.layout = QVBoxLayout()
        self.table_widget = QTableWidget()
        self.layout.addWidget(self.table_widget)
        self.setLayout(self.layout)

        self.add_button = QPushButton("Add Content")
        self.add_button.clicked.connect(self.add_content)
        self.layout.addWidget(self.add_button)

    def add_content(self):
        # 清除表格小部件
        while self.table_widget.rowCount() > 0:
            self.table_widget.removeRow(0)

        # 添加新内容
        content = [["Item 1", "Item 2", "Item 3"],
                   ["Item 4", "Item 5", "Item 6"],
                   ["Item 7", "Item 8", "Item 9"]]

        self.table_widget.setRowCount(len(content))
        self.table_widget.setColumnCount(len(content[0]))

        for i, row in enumerate(content):
            for j, item in enumerate(row):
                table_item = QTableWidgetItem(item)
                self.table_widget.setItem(i, j, table_item)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    widget = MyWidget()
    widget.show()
    sys.exit(app.exec_())