"No module named lexicon.cli" when launching lexicon on Mac

[marcelloromani]

How to reproduce:

• Install:

$ pip3 install dns-lexicon

• Launch:

$ lexicon
Traceback (most recent call last):
  File "/usr/local/bin/lexicon", line 5, in <module>
    from lexicon.cli import main
ModuleNotFoundError: No module named 'lexicon.cli'

Environment

 $ python3 --version
Python 3.7.5

OS: mac OS 10.14.6

Manual workaround:

$ export PYTHONPATH=/usr/local/lib/python3.7/site-packages