I don’t really know if this belongs in this section, or whether or not this issue is currently known.
The API documentation for some of the psychopy classes seems to have a problem. Please see http://www.psychopy.org/api/visual/elementarraystim.html and http://www.psychopy.org/api/visual/rect.html#psychopy.visual.Rect
The functions associated with the classes are absent, and in their place I see a single mro() call. I wanted to show a new user the ElementArrayStim page but as it is, the page is less helpful than it was back when I was first learning how to use ElementArrayStim.