如何在QListView中显示索引号？

from PyQt5.QtWidgets import QApplication, QListView, QStyledItemDelegate, QStandardItemModel, QStyleOptionViewItem, \
    QStyle, QStandardItem
from PyQt5.QtCore import Qt


class IndexDelegate(QStyledItemDelegate):
    def paint(self, painter, option, index):
        if option.state & QStyle.State_Selected:
            painter.fillRect(option.rect, option.palette.highlight())

        # 获取当前项的索引号
        index_number = index.row() + 1

        # 绘制索引号
        painter.drawText(option.rect, Qt.AlignLeft | Qt.AlignVCenter, str(index_number))

        super().paint(painter, option, index)


if __name__ == '__main__':
    app = QApplication([])
    list_view = QListView()

    # 创建一个QStandardItemModel对象
    model = QStandardItemModel()

    # 添加数据项到模型中，并设置索引号
    for i in range(10):
        item = QStandardItem(f"Item {i}")
        model.appendRow(item)

    # 将模型设置为QListView的模型
    list_view.setModel(model)

    # 设置项代理为自定义的IndexDelegate
    delegate = IndexDelegate()
    list_view.setItemDelegate(delegate)

    list_view.show()
    app.exec_()