​# Example-22.py
​#!/usr/bin/env python3
​import sys
​import libvirt
​
​conn = None
​try:
​    conn = libvirt.open("qemu:///system")
​except libvirt.libvirtError as e:
​    print(repr(e), file=sys.stderr)
​    exit(1)
​
​xml = '<cpu mode="custom" match="exact">' + \
​        '<model fallback="forbid">kvm64</model>' + \
​      '</cpu>'
​
​retc = conn.compareCPU(xml)
​
​if retc == libvirt.VIR_CPU_COMPARE_ERROR:
​    print("CPUs are not the same or ther was error.")
​elif retc == libvirt.VIR_CPU_COMPARE_INCOMPATIBLE:
​    print("CPUs are incompatible.")
​elif retc == libvirt.VIR_CPU_COMPARE_IDENTICAL:
​    print("CPUs are identical.")
​elif retc == libvirt.VIR_CPU_COMPARE_SUPERSET:
​    print("The host CPU is better than the one specified.")
​else:
​    print("An Unknown return code was emitted.")
​
​conn.close()
​exit(0)