app.py

# file: app.py
from flask import Flask
from redis_instance import create_redis

def create_app(script_info: ScriptInfo = None):
    app = Flask('myapp')
    with app.app_context():
        from flask import g
        g.redis = create_redis()
    return app
  
  
# file: manage.py
from .app import create_app
from flask.cli import FlaskGroup

cli = FlaskGroup(create_app=create_app)

@cli.command(with_appcontext=True)
def fill_redis():
    from flask import g
    redis = g.redis
    .... oops