编写一个QTableView的delegate，该delegate的数据类型为自定义类型

好的，我可以为您提供一个简单的示例。假设您有一个名为`CustomData`的自定义数据类型，它有两个属性：`name`和`age`。

首先，您需要编写一个自定义的Delegate类，该类继承自QItemDelegate，并且需要重写createEditor()、setEditorData()、setModelData()和updateEditorGeometry()方法。

from PyQt5.QtCore import Qt
from PyQt5.QtGui import QIntValidator
from PyQt5.QtWidgets import QItemDelegate, QLineEdit


class CustomDelegate(QItemDelegate):
    def createEditor(self, parent, option, index):
        editor = QLineEdit(parent)
        validator = QIntValidator(0, 100, editor)
        editor.setValidator(validator)
        return editor

    def setEditorData(self, editor, index):
        value = index.model().data(index, Qt.EditRole)
        editor.setText(str(value.age))

    def setModelData(self, editor, model, index):
        value = model.data(index, Qt.EditRole)
        value.age = int(editor.text())
        model.setData(index, value, Qt.EditRole)

    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)

然后，您需要在使用QTableView时将该Delegate应用于您的模型。例如：

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

class CustomData:
    def __init__(self, name, age):
        self.name = name
        self.age = age

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

    def data(self, index, role=Qt.DisplayRole):
        if role == Qt.DisplayRole:
            if index.column() == 0:
                return self._data[index.row()].name
            elif index.column() == 1:
                return self._data[index.row()].age
        elif role == Qt.EditRole:
            return self._data[index.row()]

    def setData(self, index, value, role=Qt.EditRole):
        if role == Qt.EditRole:
            self._data[index.row()] = value
            self.dataChanged.emit(index, index)
            return True
        return False

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

    def columnCount(self, parent=QModelIndex()):
        return 2

    def headerData(self, section, orientation, role=Qt.DisplayRole):
        if role == Qt.DisplayRole and orientation == Qt.Horizontal:
            if section == 0:
                return "Name"
            elif section == 1:
                return "Age"
        return QVariant()

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)

    data = [CustomData("Tom", 20), CustomData("Jerry", 30), CustomData("Lucy", 25)]
    model = CustomTableModel(data)

    view = QTableView()
    view.setModel(model)
    delegate = CustomDelegate(view)
    view.setItemDelegate(delegate)

    view.show()
    sys.exit(app.exec_())

这样，当您在TableView中编辑一行时，Delegate会将其转换为CustomData类型，并将其存储到Model中。