ti-powerbar/app/__init__.py

from flask import Flask, request, redirect, url_for, render_template
from app.views import routes
from flask import jsonify

def create_app():
    # create and configure the app
    app = Flask(__name__)
    app.config.from_pyfile('settings.py')
    app.register_blueprint(routes)
    return app

app = create_app()

@app.errorhandler(403)
def not_authorised(e):
    return jsonify(error="Not authorized"), 403

@app.errorhandler(500)
def internal_server_error(e):
    return jsonify(error="Internal server error"), 500