Merge pull request #181 from realpython/python-flask-example-heroku

python-flask-example-heroku materials

Author: jaschmitt

python-flask-example-heroku/.gitignore

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+venv
+__pycache__

python-flask-example-heroku/Procfile

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+web: gunicorn app:app

python-flask-example-heroku/README.md

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+Source files supporting the [Deploying a Python Flask Example Application Using Heroku](https://realpython.com/python-flask-example-heroku/) article on [Real Python](https://realpython.com/).

python-flask-example-heroku/app.py

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+import os
+from flask import Flask
+
+app = Flask(__name__)
+env_config = os.getenv("APP_SETTINGS", "config.DevelopmentConfig")
+app.config.from_object(env_config)
+
+
+@app.route("/")
+def index():
+    secret_key = app.config.get("SECRET_KEY")
+    return f"The configured secret key is {secret_key}."

python-flask-example-heroku/config.py

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+import os
+
+
+class Config:
+    DEBUG = False
+    DEVELOPMENT = False
+    SECRET_KEY = os.getenv("SECRET_KEY", "this-is-the-default-key")
+
+
+class ProductionConfig(Config):
+    pass
+
+
+class StagingConfig(Config):
+    DEBUG = True
+
+
+class DevelopmentConfig(Config):
+    DEBUG = True
+    DEVELOPMENT = True

python-flask-example-heroku/requirements.txt

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+click==7.1.2
+Flask==1.1.2
+gunicorn==20.0.4
+itsdangerous==1.1.0
+Jinja2==2.11.2
+MarkupSafe==1.1.1
+Werkzeug==1.0.1