ipip_route.py

import iptools
with open("chn.txt") as f,open("chnroute-ipip.txt",mode="w") as o:
    line = f.readline()
    while line:
        ip,netmask = line.split(" ")
        print("Now Processing IP: "+str(ip)+" Netmask: "+str(netmask))
        cidr = iptools.ipv4.netmask2prefix(str(netmask))
        o.writelines("prefixcmd "+str(ip)+"/"+str(cidr)+" suffixcmd\n")
        line = f.readline()