Python .pth Files Aren't Working

Directories listed in my .pth configuration file aren't appearing in sys.path. The contents of configuration file, named `some_code_dirs.pth`: ``` /home/project ``` Paths to the file: ``` /usr/lib/python2.6/site-packages/some_code_dirs.pth /usr/lib/python2.6/some_code_dirs.pth ``` Check on sys variables in the python interpreter: ``` >>> print sys.prefix '/usr' >>> print sys.exec_prefix '/usr' ``` All this seems as required in the Python documentation, but sys.path doesn't include the /home/project directory. Note that the interpreter does add the directory after: ``` >>> site.addsitedir('/usr/lib/python2.6/site-packages') ``` What am I missing here?