How can I edit PYTHONPATH on a Mac?

问题:

How can I permanently change the PYTHONPATH on a mac? I've tried editing .bash_profile, but when I use print sys.path in a file it gives a huge list of different URLs than the .bash_profile. In Terminal when I type echo $PYTHONPATH it shows a blank line. I don't want to use sys.path.append('...') because then I have to put that in every file.

回答1:

1. You can append the path to $PATH and not to $PYTHONPATH.

2. if you insist to change the PYTHONPATH, in some context that is prefferable:

   do this:

   export PYTHONPATH=$PYTHONPATH:/Users/username/pymodules
   

3. To make sure you are following the convention of what to append to PYTHONPATH see What exactly should be set in PYTHONPATH?.