Item in QListWidget cannot be checked even set the flags

[Moon River]

Hi, I am trying to make items in QListWidget checkable by user.
I followed the instructions in Qt Flags reference to set the QListWidgetItem's flags as ItemIsUserCheckable and set the check state.
However, when running the program, I found the checkboxes for items are grey and uncheckable.

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Here is my code:

# import pyside2 modules

app = QApplication()
widget = QListWidget()
for i in range(5):
    item = QListWidgetItem(str(i))
    
    item.setFlags(QtCore.Qt.ItemIsUserCheckable)
    item.setCheckState(QtCore.Qt.Unchecked)
    widget.addItem(item)

# For comparison
item = QListWidgetItem('6')
widget.addItem(item)
checkBox = QtWidgets.QCheckBox("This can be checkable")
widget.setItemWidget(item,checkBox)

widget.show()
app.exec_()

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The program screen:

The items[0-4] seems to be uncheckable.
The last one can be checkable because it is a checkbox item.

But items[0-4] should be checkable according to the reference and this tutorial

This is what I want: (Items are strings, not checkboxes)
(picture from the above tutorial )

---

So what did I miss? How could I solve it?

Thanks for any help!

[JonB]

@Moon-River
Note that your tutorial showed the line:

item->setFlags(item->flags() | Qt::ItemIsUserCheckable);

You need something like Python:

item.setFlags(item.flags() | QtCore.Qt.ItemIsUserCheckable)

else you overwrite all flags, and lose those like Qt::ItemIsEnabled and Qt::ItemIsEditable, etc.

https://doc.qt.io/qt-5/qlistwidgetitem.html#details

By default, items are enabled, selectable, checkable, and can be the source of drag and drop operations

[Moon River]

@JonB
Wow! Thanks for your help!
It works! ^_^