psutil is a module providing an interface for retrieving information
on all running processes and system utilization (CPU, memory, disks,
network, users) in a portable way by using Python, implementing many
functionalities offered by command line tools such as: ps, top, df,
kill, free, lsof, netstat, ifconfig, nice, ionice, iostat, iotop,
uptime, pidof, tty, who, taskset, and pmap.

Optional dependencies: mock and ipaddress
