Flask accessing config variables when app is created inside of function

Question

I have the following configuration for my Flask application:

File Structure:

run.py
app/
  __init__.py
  views/
    main/
      __init__.py
      main.py
  ...

__init__.py

def createpp():
  app = Flask(__name__)
  ...
  return app

main.py

...

key = app.config['KEY']
hashingID = hash(key)

@main.route('/', methods=['POST', 'GET'])
def main():
  ...
  return render_template('main/main.html')

...

As you may see, I want to access app.config['KEY'] from main.py. The issue is, since app is configured inside of create_app(), I cannot simply import it.

hashingID is always constant and is used in many different routes, otherwise I would have simply put

key = app.config['KEY']
hashingID = hash(key)

inside of the route.

Is there a way around this so that I can access config variables from an app instance that is generated inside a function? Thanks.

Asked By: Pav Sidhu

||

Source

Answer 1

It depends on what you’re trying to do.

You can see in this project where we create the Flask instance inside a create_app function, and then from that same function pass the app variable into a number of other functions that perform our various configuration tasks.

The return value of the create_app function is ultimately assigned to a top-level app variable in the module, which can then be accessed in other modules by importing it as necessary (like here).

Answered By: larsks

Flask accessing config variables when app is created inside of function

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