flask : how to architect the project with multiple apps?

Question

Lets say I want to build a project Facebook

I need a project structure like

facebook/
         __init__.py
         feed/
             __init__.py
             models.py
             business.py
             views.py
         chat/
             __init__.py
             models.py
             business.py
             views.py
         games/
             __init__.py
             models.py
             business.py
             views.py
         common/
             common.py

         runserver.py

How can I structure this well so that when I run

python facebook/runserver.py

It loads views from all my apps internally?
I want to keep this structure because extending the project further is more natural way

I am trying to follow their advice, but don't really understand where I need to write

from flask import Flask

app = Flask(__name__)

and how to import all views from all apps at one place, please help

If lets say I write the above code in facebook/__init__.py, then how in facebook/feed/views.py, I can do

from facebook import app

Answer 1

Use blueprints. Each one of your sub-applications should be a blueprint, and you load every one of them inside your main init file.

Answering your second question

from flask import Flask
app = Flask(__name__)

You should put this into facebook/__init__.py

BTW, my runserver.py and settings.py always resides one level under facebook/.

Like this:

facebook/
         __init__.py
         feed/
             __init__.py
             models.py
             business.py
             views.py
         chat/
             __init__.py
             models.py
             business.py
             views.py
         games/
             __init__.py
             models.py
             business.py
             views.py
         common/
             common.py

runserver.py
settings.py

Content of runserver.py:

from facebook import app
app.run()

I suppose the content of settings.py should not be explained.

Content of facebook/__init__.py:

from flask import Flask
app = Flask(__name__)
app.config.from_object('settings')
from blog.views import blog #blog is blueprint, I prefer to init them inside views.py file
app.register_blueprint(blog,url_prefix="/blog")