Python PyQt5 QTreeWidgetでサブアイテムを作成する方法

Python PyQt5 QTreeWidgetサブアイテム

QTreeWidgetItem.addChild(child QTreeWidgetItem)

example:

import sys
from PyQt5.QtWidgets import QTreeWidget, QTreeWidgetItem, QApplication, QWidget
if __name__ == '__main__':
    app = 0
    if QApplication.instance():
        app = QApplication.instance()
    else:
        app = QApplication(sys.argv)
    l1 = QTreeWidgetItem(["String A", "String B", "String C"])
    l2 = QTreeWidgetItem(["String AA", "String BB", "String CC"])
    for i in range(3):
        l1_child = QTreeWidgetItem(["Child A" + str(i), "Child B" + str(i), "Child C" + str(i)])
        l1.addChild(l1_child)
    for j in range(2):
        l2_child = QTreeWidgetItem(["Child AA" + str(j), "Child BB" + str(j), "Child CC" + str(j)])
        l2.addChild(l2_child)
    w = QWidget()
    w.resize(510, 210)
    tw = QTreeWidget(w)
    tw.resize(500, 200)
    tw.setColumnCount(3)
    tw.setHeaderLabels(["Column 1", "Column 2", "Column 3"])
    tw.addTopLevelItem(l1)
    tw.addTopLevelItem(l2)
    w.show()
    sys.exit(app.exec_())