Python3 unicode

[MaxKurama]

In python3 we do not have unicode strings, so we do not need to decode them.

[pwaller]

This fix is not quite right and will make successful running conditional on the system configuration.

A better fix would be to specify the encoding on the NamedTemporaryFile(*, encoding="utf-8"). Then rather than trying to .decode you can instead just get rid of the .decode. This will then work correctly on both python 2 & 3 and independently of system configuration variables such as LC_CTYPE and PYTHONIOENCODING.