Guido van Rossum added the comment:

[switching to gmail-powered account]

I'm sorry, but this seems like it should be an importlib internal affair.  The 
new exception is too much in everyone's face, because the exception name gets 
printed on every traceback.

I like #4, #3 is also acceptable.  But #4 seems best because it can obviate a 
bunch of exception message parsing in user code, I'm sure.  Though we shouldn't 
go overboard with distinguishing cases, the two different places where you 
currently raise MNFE should be distinguished IMO.

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nosy: +Guido.van.Rossum

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15767>
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