This code snippet demostrates the problem I am having.

class Item_Delegate (QStyledItemDelegate):
    def __init__ (self, parent):
        super (Item_Delegate, self).__init__ (parent)
    def paint (self, painter, option, index):
        QStyledItemDelegate.paint(painter, option, index) # Fails
        super(Item_Delegate, self).paint(painter, option, index) # But this works

I have implemented a subclass of QStyledItemDelgate. If I attempt to call the draw method of the superclass, I am successful if I call the draw (instance) method. But if I call the   QStyledItemDelgate class method draw, I get this runtime error when Qt attempts to display the QTableView:

Traceback (most recent call last):
  File "/Users/davidp/dev/python/pyside_temp/adv_qt/y.py", line 13, in paint
    QStyledItemDelegate.paint(painter, option, index) # Fails
TypeError: descriptor 'paint' requires a 'PySide2.QtWidgets.QStyledItemDelegate' object but received a 'PySide2.QtGui.QPainter'

The code I have reproduced above has my custom delegate sublcassed from QStyledItemDelegate, however the same behavior occurs if I attempt to subclass QAbstractItemDelegate.

I presume that the error is raised when the paint method examines the painter argument. I believe that the code should be have the same whether I call the instance method or the class method.

I have attached a small program that reproduces the problem.