python - What is the point of initializing extensions with the flask instance in Flask? -

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following miguel grinberg's book flask web development, have initialize alot of exetensions flask instance point of doing this?

examples

app = flask(__name__) manager = manager(app) bootstrap = bootstrap(app) moment = moment(app)

you can @ source of each of extensions see they're doing.

in general, setting configuration, setting callbacks before , after request events, , using information app initialize.

if don't pass app (or later call init_app), extension can't finish initializing , unusable.


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