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[Tim Chase]

>> I couldn't find any nice method for determining if a
>> variable referenced a module other than checking to see if
>> that item had both a "__file__" and a "__name__" attribute.
>
> Why not :
> 
> In [8]: import types, sys
> 
> In [9]: isinstance(sys, types.ModuleType)
> Out[9]: True

Yes...this is the best way to do it.  I hadn't explored (or even 
noticed, before your reply) the "types" module, which seems to 
have a large toolset for doing exactly what I wanted to.  Thanks!

A good programming language has users asking "how did I miss 
that?" rather than "why can't I make it do what I want?".  Yet 
another feather in Python's cap.

-tkc