Swagger codegen for Flask (Python). Access to shared Python object from models and controllers

So, here is my solution, in case it's useful to others. I added the heavy duty part to the __main__.py file and then made it accessible to models and controllers through the app context:

heavy = ... real heavy, gets computed once a t startup

def main():
    :
    with app.app.app_context():
        current_app.heavy = heavy

Controller methods can access the heavy stuff with:

    with current_app.app_context():
        heavy = current_app.heavy

If there is a better way to do it, please let me know. This cuts it for me. 

PS: thank you Hans for your suggestion. Didn't work for me.