environment/lib/python2.7/site-packages/IPython/utils/sysinfo.py
def _num_cpus_darwin():
    """Return the number of active CPUs on a Darwin system."""
    p = subprocess.Popen(['sysctl','-n','hw.ncpu'],stdout=subprocess.PIPE)
    return p.stdout.read()
def _num_cpus_darwin():
    """Return the number of active CPUs on a Darwin system."""
    p = subprocess.Popen(['sysctl','-n','hw.ncpu'],stdout=subprocess.PIPE)
    return p.stdout.read()
Return the number of active CPUs on a Darwin system.