Cacher is the code snippet organizer for pro developers

import iptools
with open("chn.txt") as f,open("proxifier.txt",mode="w") as o:
    line = f.readline()
    while line:
        ip,netmask = line.split(" ")
        print("Now Processing IP: "+str(ip)+" Netmask: "+str(netmask))
        ipstart,ipend=iptools.ipv4.subnet2block(str(ip)+"/"+str(netmask))
        o.writelines(ipstart+"-"+ipend+"\n")
        line = f.readline()