__init__.py

from config import config
from flask import Flask, render_template


def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)

    @app.route('/')
    def index():
        return render_template('base.html.j2')

    from .auth import auth as auth_blueprint
    app.register_blueprint(auth_blueprint, url_prefix='/auth')

    return app