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  • Christopher Smith thinks this is interesting:

Blueprints provide a nice API for encapsulating a group of related routes and templates. In smaller applications, typically everything gets registered on the app object (that is, app.route). When an application has distinct components, as ours does, blueprints can be used to separate the various moving parts.

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Cover of Learning Flask Framework

Note

I kind of understand this, but will look for more elaboration later.