import sys
import telnetlib

user ="teste"
password ="teste"

# here is my problem
for line in open('ips.txt'):
    HOST = line
    tn = telnetlib.Telnet(HOST)
    tn.read_until("Username: ")
    tn.write(user + "\n")
    tn.read_until("Password: ")
    tn.write(password + "\n")

    tn.write("enable\n")
    tn.write("cisco\n")
    tn.write(" conf t \n")
    tn.write("int loop 0 \n")
    tn.write("int ip add 1.1.1.1 255.255.255.255 \n")
    tn.write("exit \n")

#tn.write(" hostname legal" + str(n) + "\n")
print("executado com sucesso")




My file with the ips are like this
10.0.0.1
10.0.0.2
10.0.0.4