[issue20490] Show clear error message on circular import

[Brett Cannon]

Brett Cannon added the comment:

It's not as simple as it sounds because failures from "from ... import ..." are triggered in the eval loop and not in import and without thinking it through I don't know if you could use the fine-grained import locks to inspect if something is in the middle of being imported or not that way.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20490>
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