Hi Travis,

Sure this is one way of doing this but the whole point of my question is 
that I want tab-completion to produce a discoverable list of possible 
representations  -- and tab-completion can't work for function arguments. 
Of course the documentation for a "representation" method could list the 
possible choices but I would like a more direct interface than this. 

I mentioned namedtuple() in the question. Another option, that is already 
used quite a bit, is the  "catalog" mechanism behind groups.<tab> and 
codes.<tab>, but this creates a static list of methods so it's not ideal.

Andrew

On Monday, 10 November 2014 11:38:22 UTC+11, Travis Scrimshaw wrote:
>
> I would think the closest thing we have to this currently is having 
> "representation" accept a string input which redirects to the appropriate 
> class. AFAIK, we have any "official" convention about this. IMO, the single 
> method approach is best.
>
> Best,
> Travis
>
>

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