Simplify using PY2 and PY3 constants
Simplify using PY2 and PY3 constants

xavfernandez/pip,pypa/pip,rouge8/pip,sbidoul/pip,pfmoore/pip,sbidoul/pip,xavfernandez/pip,pradyunsg/pip,pfmoore/pip,rouge8/pip,pypa/pip,xavfernandez/pip,pradyunsg/pip,rouge8/pip