another positional argument error (...and executing objects stored in a list)

[ichabod801]

This bit of code is your problem:

            for i in shape_list:
                if i.isCircle():
                    circle.draw()
                elif i.isRectangle():
                    rectangle.draw()

You want to draw i, but you are drawing circle. The circle variable is rewritten every time you enter a new circle, and then appended to shape_list. Also note that both Circle and Rectangle objects have a draw method, so you don't need to figure out what type of shape it is to draw it. Try this instead:

            for shape in shape_list:
                shape.draw()