Victor,
I found a way how to deal with it.
The submitted file will show how it can be handled.

If you remove the try: finally statement.
You can see the same stdout which occurred from tarfile

But I'd like to listen to your opinion before submitting the patch. :)

➜  cpython git:(master) ✗ set -o pipefail
➜  cpython git:(master) ✗ ./python.exe ttt.py
test
hi
➜  cpython git:(master) ✗ ./python.exe ttt.py | true
➜  cpython git:(master) ✗ echo $?
32