[issue23467] Improve byte formatting compatibility between Py2 and Py3

[Giampaolo Rodola']

Changes by Giampaolo Rodola' <g.rodola at gmail.com>:


----------
nosy: +giampaolo.rodola

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23467>
_______________________________________