from flask import Flask
from flask_login import current_user, login_manager
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
login = login_manager
db = SQLAlchemy()

db.init_app(app)
login.init_app(app)
login.login_view = 'index.html'

@app.route('/')
def index():
 if not current_user:
     return render_themed_template('login.html')

 return "<center>Hello World!</center>"

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0')