[issue1720705] thread + import => crashes?

[Nick Coghlan]

Nick Coghlan added the comment:

Correction to previous comment: you can't safely perform imports from
daemon threads at all, as you have to set their daemon status before you
start them.

So, to be able to safely import from a thread other than the main thread:
- it must be created by the threading module, or otherwise guaranteed to
be terminated when the interpreter exits
- if created through the threading module, it must not be set to daemon mode

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<http://bugs.python.org/issue1720705>
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