title: jedi-vim: modules from non-standard paths
body: <p>I have different local python installations that were built with <a href="https://github.com/hashdist/hashdist" rel="nofollow">hashdist</a>. 
  On the other hand, vim is installed system-wide (ArchLinux) referencing the system's python3.</p>
  
  <p>I would like to use jedi's autocompletion for packages of one isolated python build. The modules lie in <code>some/path/lib/python2.7/site-packages</code> which is not known to the system python (hence, vim). Also, vim was compiled for python3; that "other version"  is python2.7.</p>
  
  <p>Is there any way to do this? If I could just pick one specific package that would be fine, too. $PYTHONPATH doesn't work (at least) because of the conflicting python versions.</p>