Set the data of the given index to value

        :param index: the index to set
        :type index: :class:`QtCore.QModelIndex`
        :param value: the value to set
        :param role: the role, usually edit role
        :type role: :data:`QtCore.Qt.ItemDataRole`
        :returns: True, if successfull, False if unsuccessfull
        :rtype: :class:`bool`
        :raises: None

def setData(self, index, value, role=QtCore.Qt.EditRole):
        """Set the data of the given index to value

        :param index: the index to set
        :type index: :class:`QtCore.QModelIndex`
        :param value: the value to set
        :param role: the role, usually edit role
        :type role: :data:`QtCore.Qt.ItemDataRole`
        :returns: True, if successfull, False if unsuccessfull
        :rtype: :class:`bool`
        :raises: None
        """
        if not index.isValid():
            return False
        item = index.internalPointer()
        r = item.set_data(index.column(), value, role)
        if r:
            self.dataChanged.emit(index, index)
        return r