Terry J. Reedy <tjre...@udel.edu> added the comment:

What happens if you run your program without IDLE? 
(either with right-click and run or run from Command Prompt window?) 

I would not be surprised if your problems go away. IDLE runs a saved file in a 
separate pythonw process. Printing (or writing) to stdout requires sending 
output back to the IDLE process. I can imagine that doing that from 2 
subthreads could lead to conflicts.

If the problems do go away, then we should probably close this as won't fix. 
IDLE is a development environment, not a production running environment

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nosy: +terry.reedy

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10909>
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