How about extending the input signature of Graph.is_connected() to include an option
empty_graph_is_connected = False
? (It could, of course, default to True instead, but I'm an enumeration
guy and think this is nonsense.)
Advantages, as I see them:
* True-ists and False-ists both get their way.
* Novice users of Graph.is_connected() are forced to confront the
problem by the semantics of the method itself.
* Can be configured to not break existing code (although this requires
using the obviously wrong True).
* Reflects the essentially definitional/philosophical nature of the problem.
Disadvantages, as I see them:
* Complicates the semantics of the method.
* Adds a bit of logic.
* Fails to end the philosophical debate—we'd still need to decide what
to set to default!
--Andrew
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