slackbuilds_ponce/python/Flask-SQLAlchemy
..
Flask-SQLAlchemy.info
Flask-SQLAlchemy.SlackBuild
README
slack-desc

Flask-SQLAlchemy is a Flask microframework extension which adds
support for the SQLAlchemy SQL toolkit/ORM.

python3-Flask is an optional dependency.

You need to set PYTHON3=yes,
  PYTHON3=yes ./Flask-SQLAlchemy.SlackBuild