[issue20490] Show clear error message on circular import

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:


New changeset 65366bc8bdc4716ebc361e622590b45a6e5aef07 by Steve Dower (Anthony Sottile) in branch 'master':
bpo-20490: Improve circular import error message (GH-15308)
https://github.com/python/cpython/commit/65366bc8bdc4716ebc361e622590b45a6e5aef07


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nosy: +steve.dower

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