The app.py file has the responsibility to run any application. For this file, let's start declaring the imports necessary. Note that, in addition to Flask, we import the Blueprint with all our routes and the MongoEngine instance containing the declaration of our entity:

import os 
from flask import Flask 
from views import famous_newsfrom models import db

Now, we go on to instantiate Flask and pass the settings of the environments, the database instance, and the instance of the view routes, as follows:

# instantiate the app 
app = Flask(__name__) 
 
# set config 
app_settings = os.getenv('APP_SETTINGS') 
app.config.from_object(app_settings) 
 
db.init_app(app) 
 
# register blueprints 
app.register_blueprint(famous_news)  

At the end of the file, we have a simple statement to perform Flask on port 5000:

if __name__ == '__main__': 
    app.run(host='0.0.0.0', port=5000) 

The file app.py consists of the following formatting:

import os 
from flask import Flask 
 
from views import famous_news 
from models import db 
 
# instantiate the app 
app = Flask(__name__) 
 
# set config 
app_settings = os.getenv('APP_SETTINGS') 
app.config.from_object(app_settings) 
 
db.init_app(app) 
 
# register blueprints 
app.register_blueprint(famous_news) 
 
if __name__ == '__main__': 
    app.run(host='0.0.0.0', port=5000)