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The getpass function is raising an error when first used on idle (Python 3.2 and 2.7.1)
The next time it'll work "as expected" (it echoes the data, but idle is just for testing purposes so no problems here)
>>> from getpass import getpass
>>> p = getpass()
Traceback (most recent call last):
 File "<pyshell#1>", line 1, in <module>
 p = getpass()
 File "/usr/lib/python3.2/getpass.py", line 55, in unix_getpass
 passwd = fallback_getpass(prompt, stream)
 File "/usr/lib/python3.2/getpass.py", line 114, in fallback_getpass
 stacklevel=2)
 File "/usr/lib/python3.2/idlelib/PyShell.py", line 62, in idle_showwarning
 lineno, file=file, line=line))
TypeError: idle_formatwarning() got an unexpected keyword argument 'file'
>>> p = getpass()
Warning: Password input may be echoed.
Password: ok
>>> p
'ok'
>>> 
Looking at the "/usr/lib/python3.2/idlelib/PyShell.py" file the "idle_formatwarning" function don't have the "file" argument so it should be revomed from the function call at line 61:
file.write(warnings.formatwarning(message, category, filename,
 lineno, file=file, line=line))

The problem isn't with getpass, the problem is that getpass is generating a warning message on first call and idle isn't handling that correctly. Your suggested fix is probably correct.

New changeset c9f69b28c4d1 by Senthil Kumaran in branch '2.7':
Fix closes issue12438 - idlelib.PyShell's showformatwarning method was passing an incorrect arg.
http://hg.python.org/cpython/rev/c9f69b28c4d1
New changeset e9c406a53972 by Senthil Kumaran in branch '3.2':
Fix closes issue12438 - idlelib.PyShell's showformatwarning method was passing an incorrect arg.
http://hg.python.org/cpython/rev/e9c406a53972 

Have fixed this. Even looking at the code, your suggestion was
correct. But even before the fix, I was not able to reproduce the bug
in Ubuntu and perhaps it was getting masked. May I ask, how did you
invoke idle that this bug surfaced and what was the platform?

@orsenthil
My system is Ubuntu 11.04 x64. To run idle, i press the Super (windows button) then write idle.
If I open the terminal and type "idle", the problem don't appear but I have to type the password on the terminal rather than on idle GUI.

New changeset 7dd9313c300b by Senthil Kumaran in branch '3.2':
Fix closes issue12438 - idlelib.PyShell's showformatwarning method was passing an incorrect arg.
http://hg.python.org/cpython/rev/7dd9313c300b