PyQt5 QTreeWidget 树形结构递归遍历当前所有节点的实现

import sys
from PyQt5.QtWidgets import QTreeWidgetItem, QTreeWidget, QWidget, QVBoxLayout, QPushButton, QApplication
from PyQt5.QtCore import Qt


class Demo(QWidget):
    def __init__(self):
        super().__init__()
        # 实例化一个树形结构，隐藏了header
        self.tree = QTreeWidget()
        self.tree.setHeaderHidden(True)
        # 顶级分支
        self.tree_main = QTreeWidgetItem(self.tree)
        self.tree_main.setText(0, '商品种类')
        # 设置一些二级分支
        tree_second = ['电子产品', '水果', '日用品', '喜欢的人']
        self.gen_branch(self.tree_main, tree_second)
        # 设置一些三级分支
        tree_fruit = ['苹果', '香蕉', '梨']
        tree_daily_use = ['纸巾', '毛巾']
        tree_lovers = ['迪迪1号', '迪迪2号']
        # child(1) 意思是分支的第1个节点, 序号从0算起
        self.gen_branch(self.tree_main.child(1), tree_fruit)
        self.gen_branch(self.tree_main.child(2), tree_daily_use)
        self.gen_branch(self.tree_main.child(3), tree_lovers)
        # 一个按钮
        self.pushButton = QPushButton('选好了')
        # 显示出来
        self.qvl = QVBoxLayout()
        self.qvl.addWidget(self.tree)
        self.qvl.addWidget(self.pushButton)
        self.setLayout(self.qvl)

        # 绑定一下槽函数，传入主要的分支节点
        self.pushButton.clicked.connect(lambda: self.get_checked(self.tree_main))

    @staticmethod
    def gen_branch(node: QTreeWidgetItem, texts: list):
        """ 给定某个节点和列表 在该节点生成列表内分支"""
        for text in texts:
            item = QTreeWidgetItem()
            item.setText(0, text)
            item.setCheckState(0, Qt.Unchecked)
            node.addChild(item)

    def get_checked(self, node: QTreeWidgetItem)->list:
        """ 得到当前节点选中的所有分支， 返回一个 list """
        temp_list = []
        # 此处看下方注释 1
        for item in node.takeChildren():
            # 判断是否选中
            if item.checkState(0) == Qt.Checked:
                temp_list.append(item.text(0))
                # 判断是否还有子分支
                if item.childCount():
                    temp_list.extend(self.get_checked(item))
            node.addChild(item)
        print(temp_list)
        return temp_list


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = Demo()
    win.show()
    sys.exit(app.exec_())

[
<PyQt5.QtWidgets.QTreeWidgetItem object at 0x0000000008464708>, 
<PyQt5.QtWidgets.QTreeWidgetItem object at 0x0000000008464798>, 
]

item = QtWidgets.QTreeWidgetItemIterator(self.treeWidget)，

self.item1 = QTreeWidgetItem()

self.item_list = []
self.item_list.append([... ... ])