Brett Cannon <br...@python.org> added the comment:

For the ImportWarning docs, there could stand to be more; patches welcome. =)

As for ImportError being postmortem on an error, that is not always true as 
plenty of people use the trick, e.g.:

try: import json
except ImportError: import simplejson as json

As for detecting circular imports, flagging it somehow might work, but directly 
analyzing the stack won't do since that is extremely costly on some VMs.

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