user@mashine:~$ set|grep SIG
SIGLA=value
user@mashine:~$ python
Python 2.4.4 (#2, Apr  5 2007, 20:11:18) 
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.environ.get('SIGLA')
>>>