无法在PyQt5中打印单击的行

pip install PyQt5

import sys
from PyQt5.QtWidgets import QApplication, QTableView
from PyQt5.QtCore import Qt, QAbstractTableModel, QModelIndex

class SimpleModel(QAbstractTableModel):
    def __init__(self, data):
        super().__init__()
        self._data = data

    def rowCount(self, parent=QModelIndex()):
        return len(self._data)

    def columnCount(self, parent=QModelIndex()):
        return len(self._data[0]) if self._data else 0

    def data(self, index, role=Qt.DisplayRole):
        if role == Qt.DisplayRole:
            return str(self._data[index.row()][index.column()])
        return None

class MainWindow(QTableView):
    def __init__(self, model):
        super().__init__()
        self.setModel(model)
        self.clicked.connect(self.on_row_clicked)

    def on_row_clicked(self, index):
        print(f"Row {index.row()} clicked")

if __name__ == "__main__":
    app = QApplication(sys.argv)
    data = [
        [1, 2, 3],
        [4, 5, 6],
        [7, 8, 9]
    ]
    model = SimpleModel(data)
    window = MainWindow(model)
    window.show()
    sys.exit(app.exec_())