Flask how to connect to postgresql?

Question

Flask

Hello, please tell me how to connect to postgresql in flask, or give a link, where they usually connect to sqlite)

Answer 1

postgresapp.com/documentation/configuration-python.html
but this is for SQLAlchemy + Flask

Answer 2

initd.org/psycopg

Answer 3

from sqlalchemy import create_engine
engine = create_engine('postgresql://login:[email protected]/db')