Using a shared variable between routes and main in flask

Question

I have a python flask server. In the main of my script, I get a variable from user that defines the mode of my server. I want to set this variable in main (just write) and use it (just read) in my controllers. I am currently using os.environ, but I 'm searching for more flasky way to use.

I googled and tried following options:

1. flask.g: it is being reset for each request; so, I can't use it inside controllers when it is being set somewhere else.
2. flask.session: it is not accessible outside request context and I can't set it in the main.
3. Flask-Session: like the second item, I can't set it in the main.

Answer 1

In main you use app.run() so app is avaliable in main. It should be also avaliable all time in all functions so you can try to use

app.variable = value

but flask has also

app.config

to keep any settings. See doc: Configuration Handling