[issue15767] add ModuleNotFoundError

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

For me, it mostly comes down to whether end-users are expected to see such errors generally or not.  We see ImportErrors all the time, and they are clearly errors.  If we're expected to see and deal with MNF, and if in such cases it's generally considered an error, then MNFError is better.  If it's mostly an internal/hidden thing, then MNF doesn't bother me.

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<http://bugs.python.org/issue15767>
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