Execution errors. python 2.7 & Python 3.7

[matut0]

(jsonenv) host:Python-Demo-App.2x gpabon$ python main.py
Traceback (most recent call last):
File "main.py", line 1, in
from hello import db, app
File "/Users/gpabon/Documents/workspace/oracle-ddev-db/Python-Demo-App.2x/hello/init.py", line 1, in
from hello import views
File "/Users/gpabon/Documents/workspace/oracle-ddev-db/Python-Demo-App.2x/hello/views.py", line 3, in
from hello import app, db, login_manager, db_connection
ImportError: cannot import name app