Permanently add a directory to PYTHONPATH?
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.
Instead of manipulating
PYTHONPATH you can also create a path configuration file. First find out in which directory Python searches for this information:
python -m site --user-site
For some reason this doesn't seem to work in Python 2.7. There you can use:
python -c 'import site; site._script()' --user-site
Then create a
.pth file in that directory containing the path you want to add (create the directory if it doesn't exist).
# find directorySITEDIR=$(python -m site --user-site)# create if it doesn't existmkdir -p "$SITEDIR"# create new .pth file with our pathecho "$HOME/foo/bar" > "$SITEDIR/somelib.pth"