使用ipaddr：
>>> import ipaddr>>> n1 = ipaddr.IPNetwork('192.168.1.0/24')>>> n2 = ipaddr.IPNetwork('192.168.2.0/24')>>> n3 = ipaddr.IPNetwork('192.168.2.0/25')>>> n1.overlaps(n2)False>>> n1.overlaps(n3)False>>> n2.overlaps(n3)True>>> n2.overlaps(n1)False
