[issue15767] add ModuleNotFoundError

[Christoph Groth]

Christoph Groth <christoph at grothesque.org> added the comment:

In the above, please replace "understand the decision" by "understand the usefulness of it".

In the above discussion, as an alternative to a new exception, it was proposed to add an attribute to ImportError ('reason'), but then people seemed to agree that this is quite useless outside of importlib (msg192261).  But then I don't understand why the original idea of the exception was revived.

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