When do you need path config files (.pth)?

["Martin v. Löwis"]

> It's not so much that I object to making any changes, just that I don't 
> understand why it should work on one system and not on the other.  I figure 
> there must be something else missing, or perhaps environment settings.

It depends on where the pub directory has been installed. If it was 
installed as an immediate subdirectory of site-packages or site-python, 
no further configuration is needed. If it was installed elsewhere, a 
.pth file should be created in site-packages that lists a single line 
mentioning elsewhere.

Of course, the user could overcome the missing .pth file by setting 
PYTHONPATH, but the rationale for creating .pth files is that not every 
user of a system needs to set PYTHONPATH.

HTH,
Martin