[Python-Dev] Fix import errors to have data

[Greg Ewing]

> That might be over-cautious.  It's probably safe to keep modules whose body 
> code executed without error.

No, it's not. If A and B import each other, and A fails after
importing B, then B ends up with a reference to a broken A
even though it executed without error.

Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury,	   | A citizen of NewZealandCorp, a	  |
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greg at cosc.canterbury.ac.nz	   +--------------------------------------+