Permanently add a directory to PYTHONPATH?
python, pythonpath, windows
Solution
You need to add your new directory to the environment variable `PYTHONPATH`, separated by a colon from previous contents thereof. In any form of Unix, you can do that in a startup script appropriate to whatever shell you're using (`.profile` or whatever, depending on your favorite shell) with a command which, again, depends on the shell in question; in Windows, you can do it through the system GUI for the purpose.
`superuser.com` may be a better place to ask further, i.e. for more details if you need specifics about how to enrich an environment variable in your chosen platform and shell, since it's not really a programming question per se.
Problem
Whenever I use `sys.path.append`, the new directory will be added. However, once I close python, the list will revert to the previous (default?) values. How do I permanently add a directory to `PYTHONPATH`?