I once hosted the following flask page at flask.dlma.com. It cites Flask on Dreamhost Shared Website Hosting. At DreamHost, Flask required Passenger, which they discontinued.

passenger_wsgi.py

import sys, os
INTERP = os.path.join(os.environ['HOME'], 'flask.dlma.com', 'py3venv', 'bin', 'python3')
if sys.executable != INTERP:
        os.execl(INTERP, INTERP, *sys.argv)
sys.path.append(os.getcwd())
 
from flask import Flask
application = Flask(__name__)
 
@application.route('/')
def index():
    return 'Hello from Passenger.\nSee https://www.brettsbeta.com/blog/2020/07/flask-on-dreamhost-shared-website-hosting/'