user = input('Enter your remote account: ')
password = getpass.getpass()
tn = telnetlib.Telnet(HOST)
tn.read_until('login: ')
tn.write(user + '\n')
if password:
    tn.read_until('Password: ')
tn.write(password + '\n')
tn.write('ls\n')
tn.write('exit\n')
print(tn.read_all())
Написание telnet-клиента