更改qtablewidget中的颜色(单击)

from PyQt5.QtWidgets import QApplication, QMainWindow, QTableWidget, QTableWidgetItem
from PyQt5.QtGui import QColor
from PyQt5.QtCore import Qt

class MyTableWidget(QTableWidget):
    def __init__(self, rows, columns):
        super().__init__(rows, columns)
        self.clicked.connect(self.on_table_clicked)

    def on_table_clicked(self, index):
        row = index.row()
        column = index.column()
        item = self.item(row, column)
        item.setBackground(QColor(Qt.red))  # 设置背景色为红色

if __name__ == '__main__':
    app = QApplication([])
    window = QMainWindow()
    table_widget = MyTableWidget(3, 3)
    window.setCentralWidget(table_widget)
    window.show()
    app.exec_()