[issue12583] More detailed `ImportError` messages

[Ram Rachum]

Ram Rachum <cool-rr at cool-rr.com> added the comment:

What's the problem with detecting circular imports? Mind you that we only need a post-mortem analysis to check why the import failed; so after the import failed, we could check whether our import stack has a loop in it.

I'm not familiar with the ImportWarning regarding `__init__.py`. Is this written about anywhere?

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<http://bugs.python.org/issue12583>
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