[Flask] Globally accessible variables in Flask

[badrihippo at gmail.com]

I know I figured this out sometime, but can't remember now. How does 
one make a variable that is automatically accessible to all views?

I mean like the current_user variable provided by Flask-Admin: it 
automatically calculates current_user and makes it available to the 
view for each request, without having to manually define it each time.

Basically, make it so that instead of...

> @app.route('/example')
> def example():
>     my_var = something()
> 
> @app.route('/example/2')
> def second_example():
>     my_var = something()

...it automatically calculates my_var without having to manually define 
it in each view.

Okay, I hope that was clear. And thanks in advance!

—Badri/Hippo
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