telnet session

[eight02645999]

hi
i am using a telnet session to simulate an authentication mechanism
USER = "user"
PASSWORD = "password"
try:
telnet = telnetlib.Telnet(HOST)
telnet.set_debuglevel(5)
telnet.read_until("login: ")
telnet.write(USER + "\n")
telnet.read_until("Password: ")
telnet.write(PASSWORD + "\n")
except:
print "failed to telnet"
else:
try:
telnet.write("ls\n")
except:
print "cannot ls"
else:
telnet.write("exit\n")
print telnet.read_all()


When i purposely input a wrong password, it "hangs" at the login prompt
waiting for
login and Password. The host i am telnetting to is a unix server.
How can i "exit" this login prompt if the user keys in wrong password
in my script?

thanks