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The str->Unicode change widened IDLE/batch discrepancy.
In python 2.x, bytes are printable.
>>> for i in range(256): print i, chr(i)
works fine. In python 3, chr has become (the old) unichr, and whether a 
unicode character is printable depends on the environment. In particular, 
under my Windows XP, the equivalent
>>> for i in range(256): print (i, chr(i))
will still work fine under IDLE, but will now crash with an 
UnicodeEncodeError when run from the command line.
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Unfortunately, I'm not sure what the right solution actually is, other than 
a mention in the Whats New document. 
I believe the 2.5 code was using a system page to print those characters, as 
they often looked like letters rather than <control>. Copying that would 
probably be the wrong solution.
Limiting IDLE would add consistency, but might be a lot of work for the 
equivalent of a --pedantic flag.
PEP 3138 seems to be proposing a default stdout BackslashReplace, which may 
at least help.