[issue19625] IDLE 2.7 should use UTF-8 as it's default encoding

[Stéphane Wirtel]

On OS X and with IDLE 3, I get utf-8 with sys.stdout.encoding, not sure, 
but I think you have to check the default encoding on Windows.

What’s the result if you execute:

python3 -c 'import sys; print(sys.getdefaultencoding())'