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 app.doc.main_swag import main_swagger

app = Flask(__name__)
from app.config import FlaskTesting, FlaskProduction

app.config.from_object(FlaskTesting)

flask_mail = Mail(app)
jwt_manager = JWTManager(app)
swag = Swagger(app, template=main_swagger)


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 . import jwt_utils

    return app