import telnetlib

def reconnect():
    HOST = "fritz"
    user = "root"
    password = "geheim"
    tn = telnetlib.Telnet(HOST)
    tn.read_until("login: ")
    tn.write(user + "\n")
    tn.read_until("Password: ")
    tn.write(password + "\n")
    print "Killing dsld..."
    tn.write("dsld -s\n")
    tn.read_until("#")
    print "Restarting dsld..."
    tn.write("dsld -i -n\n")
    tn.read_until("#")
    tn.write("exit\n")
    tn.read_all()

reconnect()