[WxPython] TypeError: request for something already fulfilled?

[merlem]

Oh. Unfortunately, 'item' is nowhere explained in the docs (as far as I can say).
How do I make one, then?

Edit:
I checked the tutorials
https://wiki.wxpython.org/GridBagSizerTutorial
https://github.com/wxWidgets/wxPython/bl...agSizer.py
https://www.tutorialspoint.com/wxpython/...gsizer.htm
http://zetcode.com/wxpython/layout/

and none gives a binding information about what an 'item' might be in this case, except one small piece of information from the last one: "Item is a widget that you insert into the grid."

Well, for 'widget' again the wypyrhon docs offer no reference, not to mention a binding defintion. (At least I can't find any.)
Left to guesswork oncemore... but at least 'widget' sound a bit more 'qualificatory' then 'item' what I assumed to be a quite wide range of beings...