[GNC] MacOS Mojave Python Bindings - No module named gnucash

[Aaron Surrain]

I'm just getting started, running macOS Mojave, and trying to import 
from QuickBooks. I tried installing GNU Cash with Python Bindings per 
these instructions…

https://wiki.gnucash.org/wiki/MacOSX/MacPortsDetail

…and running the scripts from Jonathan Corbet's article…

https://lwn.net/Articles/729087/

…but I'm getting the error…

ImportError: No module named gnucash

…whenever I run Jonathan's script. I tried running it from the 
directory where I cloned it from github like this…
$ python ./qb_iif_to_gc -c -r ~/Downloads/exportQuickBooks.IIF
$ python2 ./qb_iif_to_gc -c -r ~/Downloads/exportQuickBooks.IIF
$ python3 ./qb_iif_to_gc -c -r ~/Downloads/exportQuickBooks.IIF

…and a few variations without -c and -r.

Some about my environment:

$ which -a python
/usr/local/bin/python
/usr/bin/python

$ which -a python2
/usr/local/bin/python2

$ which -a python3
/usr/local/bin/python3

$ echo $PYTHONPATH
:/opt/local/lib/python2.7/site-packages

$ ls /opt/local/lib/python2.7/site-packages/
xcbgen

Any pointers?

Thanks!
Aaron