[issue12583] More detailed ImportError messages

[Ram Rachum]

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

Brett: Why does it matter that it will be costly? It's a post-mortem activity anyway, usually done when something critical failed and the entire system isn't working.

Why would functions need to be looked at? I mean, isn't a circular import when you try to import a module `foo` while in a lower stack level you haven't finished importing `foo` yet? Does it get trickier than that?

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