Roger Serwy <roger.se...@gmail.com> added the comment:

Andrew, I do admit that I have a lot to learn about Unicode support in Python, 
for instance with its error-handling and its corner cases.

On Windows Vista, I do see that print() behaves differently than evaluating the 
expression. An exception is raised for:
   print('\N{GOTHIC LETTER AHSA}')

On Linux, I see the character print as ? in xterm and as a '?' when evaluated. 
In gnome-terminal (Ubuntu Mono font) it prints as a box containing the code 
point in hex. No exception is raised.

I do see your point. The patch I provided always substitutes the unsupported 
character with its full expansion. Returning to a point earlier raised by 
Martin, using REPLACEMENT CHARACTER instead would be better. It would make the 
behavior of IDLE more consistent with xterm and gnome-terminal, although it 
would cause IDLE to hide errors if the program ran from a Windows console 
instead of IDLE. 

Given that Windows and Linux (Ubuntu) behave differently, I'd rather let IDLE 
mimic the behavior of a Linux console than a Windows console.

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<http://bugs.python.org/issue14200>
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