On Wednesday, August 6, 2014 10:34:36 PM UTC-7, kcrisman wrote:
>
> Consider
>
> plot(Graph({1:[2],1:[3]}))
>
> I would expect two edges.  Instead the vertex 2 isn't even there.  Is this 
> a bug or a feature?  The documentation for this way of entering graphs is 
> pretty terse so I was quite surprised by this outcome.
>

Sage never comes into play here. Dictionary literals ("Dictionary displays" 
in official python lingo) are defined to be evaluated left-to-right, in 
order. See 
https://docs.python.org/2/reference/expressions.html#dictionary-displays 

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