[issue37444] Differing exception between builtins and importlib when importing beyond top-level package

[Miro Hrončok]

Miro Hrončok <miro at hroncok.cz> added the comment:

While raising ImportError certainly makes much more sense in this case, this change is backwards incompatible and there was no DeprecationWarning. I don't consider that fair.

As a certain compromise, we could maybe raise a custom ImportError+ValueError offspring (e.g. BeyondToplevelImportError)?

If feeling fancy, we could rise a DeprecationWarning when issublcass(BeyondToplevelImportError, ValueError) is used?

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nosy: +hroncok

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<https://bugs.python.org/issue37444>
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