[mag@vertex:~]% python
Python 2.4.4 (#2, Aug 16 2007, 02:03:40) 
[GCC 4.1.3 20070812 (prerelease) (Debian 4.1.2-15)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> help(_)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name '_' is not defined
>>>