diff --git a/python-flask-example-heroku/.gitignore b/python-flask-example-heroku/.gitignore
index 5ceb3864c2911029f0a6010fadab352e4b8e2d07..d75edeaec0ee8b547be47de1ceacdec0a414aeed 100644
--- a/python-flask-example-heroku/.gitignore
+++ b/python-flask-example-heroku/.gitignore
@@ -1 +1,2 @@
 venv
+__pycache__
\ No newline at end of file
diff --git a/python-flask-example-heroku/app.py b/python-flask-example-heroku/app.py
index 82b9e4511b750b06c0448d5ee7cf60ad1e287d16..a80c6dd6fb35103e89cde774475866caf186ce9f 100644
--- a/python-flask-example-heroku/app.py
+++ b/python-flask-example-heroku/app.py
@@ -2,9 +2,11 @@ import os
 from flask import Flask
 
 app = Flask(__name__)
-app.config.from_object(os.getenv("APP_SETTINGS", "config.DevelopmentConfig"))
+env_config = os.getenv("APP_SETTINGS", "config.DevelopmentConfig")
+app.config.from_object(env_config)
 
 
 @app.route("/")
 def index():
-    return f"The configured secret key is {app.config.get('SECRET_KEY')}"
+    secret_key = app.config.get("SECRET_KEY")
+    return f"The configured secret key is {secret_key}."
diff --git a/python-flask-example-heroku/config.py b/python-flask-example-heroku/config.py
index 15ebf6c77804f73c7203ecdb4cf578493209c00a..40d3c4dec3efc74fb6b305dbb9ed2f9fa28aca5b 100644
--- a/python-flask-example-heroku/config.py
+++ b/python-flask-example-heroku/config.py
@@ -1,21 +1,20 @@
 import os
 
 
-class Config(object):
+class Config:
     DEBUG = False
-    TESTING = False
-    SECRET_KEY = os.getenv("SECRET_KEY", "this-is-read-from-env")
+    DEVELOPMENT = False
+    SECRET_KEY = os.getenv("SECRET_KEY", "this-is-the-default-key")
 
 
 class ProductionConfig(Config):
-    DEBUG = False
+    pass
 
 
 class StagingConfig(Config):
-    DEVELOPMENT = True
     DEBUG = True
 
 
 class DevelopmentConfig(Config):
-    DEVELOPMENT = True
     DEBUG = True
+    DEVELOPMENT = True