Flask==1.0.2
Flask-SQLAlchemy==2.4.0
Flask-Login==0.4.1

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager

db = SQLAlchemy()
login = LoginManager()
login.login_view = 'user.login'

def create_app(config_class=Config):
    app = Flask(__name__)
    app.config.from_object(config_class)

    db.init_app(app)
    login.init_app(app)

    from app.main import mod_main
    app.register_blueprint(mod_main, url_prefix='/')

    from app.user import mod_user
    app.register_blueprint(mod_user, url_prefix='/user')