QTreeWidgetItem.setItemWidget(item, k, QCheckBox()) not working (checkbox doesn't show up)

[enjoysmath]

I'm trying to recursively build a QTreeWidget using a python dictionary. A "[ ]" in a dictionary key/value means add a checkbox. No checkboxes show up no matter what column k I add the checkbox to. I also have another solution for adding a checkbox using one and only one column, should I go ahead and use that? It would be nice to have two columns though, since the code is cleaner.

from PyQt5.QtWidgets import QTreeWidgetItem, QCheckBox, QDockWidget
from PyQt5.QtCore import Qt
from ui_cec_spec_filter_dock import Ui_CECSpecFilterDock
from collections import OrderedDict

HDMI_CEC_Spec = OrderedDict({
    "Initiator" : {
        "TV | [ ]": {
            "Nibble": "0",
            "Comment": "",
        },
        "Recording Device 1 | [ ]": {
            "Nibble": "1",
            "Comment": "_",
        },
    },
    "Follower" : {
    },
    "Command" : {
        
    }
})

class CECSpecFilterDock(QDockWidget, Ui_CECSpecFilterDock):
    def __init__(self, new=True):
        super().__init__()
        super().__init__()
        self.setupUi(self)
        #self.setFocusPolicy(Qt.NoFocus)         # BUGFIX: gets rid of weird dotted selection line around tree items
        self.checkbox = {}
        if new:
            self.buildTree(HDMI_CEC_Spec, self.treeWidget.invisibleRootItem()) 

    def buildTree(self, tree, item):
        if isinstance(tree, dict):
            for string, subtree in tree.items():
                tree_item = self.buildTreeItem(string)
                item.addChild(tree_item)
                self.buildTree(subtree, tree_item)
        else:   # expects a string
            item.addChild(self.buildTreeItem(tree))
        
    def buildTreeItem(self, string):
        columns = string.split(" | ")
        tree_item = QTreeWidgetItem()
        for k in range(0, len(columns)):
            column = columns[k]
            if "[ ]" in column or "[*]" in column:
                self.checkbox[string] = QCheckBox("dur")
                self.treeWidget.setItemWidget(tree_item, k, self.checkbox[string])
                if "*" in column:
                    checkbox.setChecked(True)
            else:
                if "_" in column:
                    column = column[:-1]
                    tree_item.setFlags(tree_item.flags() | Qt.ItemIsEditable)
                tree_item.setText(k, column)
        return tree_item

[enjoysmath]

Fixed it.

You have to make sure that the QTreeWidgetItem is actually in the tree first before calling setItemWidget on the tree.