swag-shop/app/__init__.py

from flask import Flask
from flask_jwt_extended import JWTManager
from flask_mail import Mail
from flasgger import Swagger
from flask_cors import CORS

app = Flask(__name__)
jwt_manager = JWTManager(app)
mail = Mail(app)
swag = Swagger(app)
cors = CORS(app)

def create_app():
	from app.api import bp, bp_errors, bp_product, bp_user, bp_cart
	app.register_blueprint(bp)
	app.register_blueprint(bp_errors)
	app.register_blueprint(bp_product)
	app.register_blueprint(bp_user)
	app.register_blueprint(bp_cart)

	from app.config import FlaskTesting, FlaskProduction
	app.config.from_object(FlaskTesting)

	from . import jwt_utils

	return app