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test_sys.py:

- I agree that it's not worth testing the code paths that
will invoke a custom
   __displayhook__ or __excepthook__, but I regret it
nevertheless. :-)
   maybe this deserves a comment?

- sys.exit() should also be callable with a string

- you could check that the value of the SystemExit exception
has the right
   exit code

- Have you checked this with Jython? I don't know if it
implements all
   of these; in particular I doubt it has getrefcount().

- I presume you've tested this on Windows?

Sorry, I can't help you with charmapcodec