running warnings

[memcached at aol.com]

I wrote these codes pieces:
 
try:
import termios, TERMIOS
except  ImportError:
try:
import  msvcrt
except  ImportError:
try:
from EasyDialogs import  AskPassword
except  ImportError:
getpass =  default_getpass
else:
getpass = AskPassword
else:
getpass =  win_getpass
else:
getpass =  unix_getpass
 
 
When running I got the error warnings:
 
/usr/lib/python2.3/TERMIOS.py:7: DeprecationWarning: the TERMIOS module is  
deprecated; please use termios
DeprecationWarning)
Traceback (most  recent call last):
File "t2.py", line 18, in ?
getpass = unix_getpass
NameError: name 'unix_getpass' is not defined
 
 
Can you tell me what're there warnings and how to avoid  them?Thanks!
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