Use multiprocessing.cpu_count()
Use multiprocessing.cpu_count()

os.cpu_count() is new to Python 3.4.

ctismer/caniusepython3,dhamaniasad/caniusepython3,nett55/caniusepypy,brettcannon/caniusepython3,public/caniusepypy,svisser/caniusepython3