import time
import libvirt

conn = libvirt.open("qemu:///system")

while True:
    try:
        print(conn.getAllDomainStats())
        print("")
        time.sleep(1)
    except libvirt.libvirtError as e:
        print("Got libvirt error: %s" % str(e))
        conn.close()
        conn = libvirt.open("qemu:///system")