This one will take some more tracing. There are checks when something is a 
list/tuple and then there are checks of elements of such things, both break 
with iterators. Thank you for uncovering these places!

On Thursday, 4 June 2020 12:31:05 UTC-6, kcrisman wrote:
>
> I am actually in the midst of collating this.  But one indication the 
> doctests are not so helpful is this one, directly from the 
> interact_compatibility.py.  If you change the (1..10) to [1..10], which 
> makes a list and not a generator, it does fine.  Anyway, I am trying to 
> make a good document that can serve as a "master reference" - really, all 
> three APIs take directly from the original sagenb one pretty directly, 
> except Sage cell and CoCalc have more functionality and Jupyter has a few 
> differences (so far as I can tell as yet).  
>
> It would be interesting to know where such a document should live!  I'm 
> not sure.
>
> sage: @interact 
>
> ... def _(R=selector([ZZ,QQ,GF(17),RDF,RR]), n=(1..10)):
>
> ... M = random_matrix(R, n)
>
> ... show(M)
>
> ... show(matrix_plot(M,cmap='Oranges'))
>
> ... f = M.charpoly()
>
> ... print(f)
>
> <html>...
>

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