How can I disable expanding on a QTreeView for one row?

I want to make it so that one row does not have the expanding carrot, but can still be selected.

I tried this:

import sys
from PySide2.QtWidgets import QApplication, QMainWindow, QTreeView, QVBoxLayout, QWidget, QAbstractItemView, QSizePolicy, QStyledItemDelegate
from PySide2.QtCore import Qt, QModelIndex
class CustomItemDelegate(QStyledItemDelegate):
def sizeHint(self, option, index):
size = super().sizeHint(option, index)
if index.row() == self.model.max_display_rows:
size.setWidth(0)  # Hide the expanding icon
return size
class CustomItemModel(QAbstractItemModel):
def init(self, data, parent=None):
super().init(parent)
self.data = data
self.max_display_rows = 5
<span class="hljs-comment"># ... (rest of the model methods)</span>

class MainWindow(QMainWindow):
def init(self):
super().init()
    self.setWindowTitle(<span class="hljs-string">"Custom Item Model Example"</span>)
    self.setGeometry(<span class="hljs-number">100</span>, <span class="hljs-number">100</span>, <span class="hljs-number">400</span>, <span class="hljs-number">300</span>)

    data = [<span class="hljs-string">"Item {}"</span>.<span class="hljs-built_in">format</span>(i) <span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-built_in">range</span>(<span class="hljs-number">1</span>, <span class="hljs-number">11</span>)]

    self.model = CustomItemModel(data)
    self.treeView = QTreeView()
    self.treeView.setModel(self.model)
    self.treeView.setSelectionBehavior(QAbstractItemView.SelectRows)
    self.treeView.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)

    delegate = CustomItemDelegate(self.treeView)
    self.treeView.setItemDelegate(delegate)

    layout = QVBoxLayout()
    layout.addWidget(self.treeView)

    central_widget = QWidget()
    central_widget.setLayout(layout)
    self.setCentralWidget(central_widget)

def main():
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
if name == "main":
main()

it doesn't work.