def get_all_under_item(item):
    """
    Returns all the children of a specific QTreeWidgetItem

    :param item: <QTreeWidgetItem>
    :return: <list> QTreeWidgetItems
    """
    items = []
    for index in range(item.childCount()):
        items.append(item.child(index))
        items.extend(get_all_under_item(item.child(index)))
    return items