Load config from 'config.py'.

app/__init__.py

+from config import config
 from flask import Flask
 
 
-def create_app():
+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 'Opaque'
 
     return app

opaque.py

 from app import create_app
+import os
 
 
-app = create_app
+app = create_app(os.getenv('FLASK_CONFIG') or 'default')