[issue15685] PEP 3121, 384 Refactoring applied to itertools module

[Robin Schreiber]

Changes by Robin Schreiber <robin.schreiber at me.com>:


----------
keywords: +pep3121 -patch
nosy: +loewis

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15685>
_______________________________________