Brett Cannon added the comment:
In this instance where there are only a set number of options are expected to
be officially valid, yes I think enums are a good fit.
As for strings, the only way I would be okay with that is defining the strings
either as attributes on ImportError itself or off of importlib to make it easy
to do a comparison. But in that case I might as well just drop _not_found and
use ``str(exc).startswith('No module named ')`` to detect what I need and be
done with it.
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