Установка данных в ячейку QTableWidget

# -*- coding: utf-8 -*-
import sys
from PyQt5.QtWidgets import QApplication, QTableWidget, QTableWidgetItem, QItemDelegate, QComboBox
from PyQt5.QtCore import Qt
 
class ComboBoxDelegate(QItemDelegate):
 
    def __init__(self, parent, items=[]): 
        QItemDelegate.__init__(self, parent) 
        self.items = items
 
    def createEditor(self, parent, option, index):
        if not index.isValid():
            return None
        editor = QComboBox(parent)
        editor.addItems(self.items)
        return editor
 
    def setEditorData(self, editor, index):
        if not index.isValid():
            return None
        editor.setCurrentIndex(index.data(Qt.UserRole))
 
    def setModelData(self, editor, model, index):
        model.setData(index, editor.currentIndex(), Qt.UserRole)
        model.setData(index, editor.currentText(), Qt.DisplayRole)
        return None
 
class Table(QTableWidget):
 
    def __init__(self, parent=None):
        QTableWidget.__init__(self, parent)
        
        self.__initUI__()
        self.addItem()
 
        if not parent:
            self.show()
 
    def __initUI__(self):
        self.setColumnCount(1)
        self.setRowCount(1)
        self.setItemDelegateForColumn(0, ComboBoxDelegate(self, ["first", "second", "third"]))
 
    def addItem(self):
        item = QTableWidgetItem()
        item.setData(Qt.UserRole, 2)
        self.setItem(0, 0, item)
 
 
if __name__ == '__main__':    
    app = QApplication(sys.argv)
    main = Table()
    app.exec_()