如何在PyQt5中发送dataChanged

from PyQt5.QtCore import QAbstractItemModel, QModelIndex, Qt

class MyModel(QAbstractItemModel):
    def __init__(self, data, parent=None):
        super().__init__(parent)
        self.data = data

    def rowCount(self, parent=QModelIndex()):
        if parent.isValid():
            return 0
        return len(self.data)

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

    def data(self, index, role=Qt.DisplayRole):
        if not index.isValid() or role != Qt.DisplayRole:
            return None
        row = index.row()
        column = index.column()
        return self.data[row][column]

    def setData(self, index, value, role=Qt.EditRole):
        if not index.isValid() or role != Qt.EditRole:
            return False
        row = index.row()
        column = index.column()
        self.data[row][column] = value
        self.dataChanged.emit(index, index, [role], [value])
        return True

    def flags(self, index):
        if not index.isValid():
            return Qt.NoItemFlags
        return Qt.ItemIsEditable | Qt.ItemIsEnabled

# 创建数据模型
data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
model = MyModel(data)

# 连接dataChanged信号到槽函数
def handleDataChanged(topLeft, bottomRight, roles, newValues):
    print("Data changed:", topLeft.row(), topLeft.column(), newValues)

model.dataChanged.connect(handleDataChanged)

# 修改数据
index = model.index(0, 0)
model.setData(index, 10)