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

Try running without IDLE (double click, right-click run, Command Prompt window, 
or paste into interpreter window). IDLE runs code in a subprocess with stdout 
directed back to the IDLE process, so it occasionally affects otherwise legal 
and correct Python code.

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nosy: +terry.reedy

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13220>
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