class StringListModel(QAbstractListModel):
    def __init__(self, strings):
        QAbstractListModel.__init__(self)
        self._stringList = strings
    def rowCount(self, parent=None):
        return len(self._stringList)
    def data(self, index, role):
        if not index.isValid():
            return None
        if index.row() >= len(self._stringList):
            return None
        if role == Qt.DisplayRole or role == Qt.EditRole:
            return self._stringList[index.row()]
        else:
            return None
        pass
    def headerData (self, selection, orentation, role=Qt.DisplayRole):
        if role != Qt.DisplayRole:
            return None
        if orentation == Qt.Horizontal:
            return 'Column %s'%selection
        else:
            return 'Row %s'%selection
        pass
    def flags(self, index):
        if not index.isValid:
            return Qt.ItemIsEnabled
        return super(StringListModel, self).flags(index) | Qt.ItemIsEditable
    def setData(self, index, value, role):
        if index.isValid and role == Qt.EditRole:
            self._stringList[index.row()] = value
            self.dataChanged.emit(index, index)
            return True
        return False
    def insertRows(self, position, rows, parent = QModelIndex()):
        self.beginInsertRows(QModelIndex(), position, position+rows-1)
        i = 0
        while i < rows:
            self._stringList.insert(position, '')
            i += 1
        self.endInsertRows()
        return True
    def removeRows(self, position, rows, parent = QModelIndex()):
        self.beginRemoveRows(QModelIndex(), position, position+rows-1)
        i = 0
        while i < rows:
            del self._stringList[position]
            i += 1
        self.endRemoveRows()
        return True

 def data(self, index, role):
        if index.isValid() and  index.row() < len(self._stringList):
            if role == Qt.DisplayRole or role == Qt.EditRole:
                return self._stringList[index.row()]
            elif role == .....