No Qt.UserRole in PyQt6 - qt

Question

I'm trying to implement a basic progress bar using a delegate within a TreeView widget. I've double-checked the official documentation, and confirmed that the UserRole is supposed to be contained in PyQt6.QtCore.Qt. However, I always get the error upon trying to launch the code
AttributeError: type object 'Qt' has no attribute 'DisplayRole'
How can I solve this problem?
import sys
from PyQt6 import QtWidgets, QtGui
from PyQt6.QtCore import Qt
print(Qt.UserRole)
class ProgressBarDelegate(QtWidgets.QStyledItemDelegate):
def paint(self, painter, option, index):
# Get the data for the item
progress = index.data(Qt.UserRole)
# Draw the progress bar
painter.save()
rect = option.rect
rect.setWidth(int(rect.width() * progress))
painter.fillRect(rect, QtGui.QColor("#00c0ff"))
painter.restore()
class MainWindow(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
# Set up the tree view
self.tree_view = QtWidgets.QTreeView(self)
self.setCentralWidget(self.tree_view)
# Set up the model
self.model = QtGui.QStandardItemModel(self)
self.tree_view.setModel(self.model)
# Add some items to the model
for i in range(10):
item = QtGui.QStandardItem("Item {}".format(i))
progress = i / 10
item.setData(progress, Qt.UserRole)
self.model.appendRow(item)
# Set the delegate for the progress bar column
self.tree_view.setItemDelegateForColumn(1, ProgressBarDelegate(self))
app = QtWidgets.QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec())
Update:
I've tried Qt.ItemDataRole.UserRole, it didn't give the error above, but the progress bar didn't show up.