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Author Guido.van.Rossum
Recipients Arfrever, Guido.van.Rossum, asvetlov, barry, brett.cannon, chris.jerdonek, cvrebert, eric.snow, ezio.melotti, gvanrossum, pitrou, python-dev, serhiy.storchaka
Date 2013-07-02.04:54:09
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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.
Date User Action Args
2013-07-02 04:54:10Guido.van.Rossumsetrecipients: + Guido.van.Rossum, gvanrossum, barry, brett.cannon, pitrou, ezio.melotti, Arfrever, cvrebert, asvetlov, chris.jerdonek, python-dev, eric.snow, serhiy.storchaka
2013-07-02 04:54:10Guido.van.Rossumsetmessageid: <>
2013-07-02 04:54:10Guido.van.Rossumlinkissue15767 messages
2013-07-02 04:54:09Guido.van.Rossumcreate