On Fri, 17 May 2019, Inada Naoki wrote:
This is slightly off topic (not relating to your problem), but please don't think "Python 3 doesn't require __init__.py for packages". It is common misunderstanding.
Inada, Actually, your response is on topic and probably the reason I have the import problem.
Package directory without __init__.py is "namespace package". Namespace package is not a regular package. See [1] for detail.
Thank you for correcting me. Regards, Rich -- https://mail.python.org/mailman/listinfo/python-list