This is the official Heroku buildpack for Python apps.
Recommended web frameworks include Django and Flask, among others. The recommended webserver is Gunicorn. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to
$PORT, and only the HTTP protocol is permitted for incoming connections.
Python packages with C dependencies that are not available on the stack image are generally not supported, unless
manylinux wheels are provided by the package maintainers (common). For recommended solutions, check out this article for more information.
$ ls my-application requirements.txt runtime.txt $ git push heroku master Counting objects: 4, done. Delta compression using up to 8 threads. Compressing objects: 100% (2/2), done. Writing objects: 100% (4/4), 276 bytes | 276.00 KiB/s, done. Total 4 (delta 0), reused 0 (delta 0) remote: Compressing source files... done. remote: Building source: remote: remote: -----> Python app detected remote: -----> Installing python-3.7.4 remote: -----> Installing pip remote: -----> Installing SQLite3 remote: -----> Installing requirements with pip remote: Collecting flask (from -r /tmp/build_c2c067ef79ff14c9bf1aed6796f9ed1f/requirements.txt (line 1)) remote: Downloading ... remote: Installing collected packages: Werkzeug, click, MarkupSafe, Jinja2, itsdangerous, flask remote: Successfully installed Jinja2-2.10 MarkupSafe-1.1.0 Werkzeug-0.14.1 click-7.0 flask-1.0.2 itsdangerous-1.1.0 remote: remote: -----> Discovering process types remote: Procfile declares types -> (none) remote:
requirements.txt must be present at the root of your application's repository to deploy.
To specify your python version, you also need a
runtime.txt file - unless you are using the default Python runtime version.
Current default Python Runtime: Python 3.6.9
Alternatively, you can provide a
setup.py file, or a
Pipenv will generate
runtime.txt based on
python-version at build time.
You can specify the latest production release of this buildpack for upcoming builds of an existing application:
$ heroku buildpacks:set heroku/python
Supported runtime options include:
To run the test suite:
Or to test in a particular stack:
make test-heroku-18 make test-heroku-16
The tests are run via the vendored shunit2 test framework.
If you need to install dependencies stored in private repositories, but you don't want to hardcode passwords in the code, you can use the following approach.
Generate or use an existing a new SSH key pair (https://help.github.com/articles/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent/)
For this example, assume that you named the key
Add the public ssh key to your private repository account.
Add CUSTOM_SSH_KEY and CUSTOM_SSH_KEY_HOSTS environment variables to you heroku app
# OSX $ heroku config:set CUSTOM_SSH_KEY=$(base64 --input ~/.ssh/deploy_key.pub) CUSTOM_SSH_KEY_HOSTS=bitbucket.org,github.com # Linux $ heroku config:set CUSTOM_SSH_KEY=$(base64 ~/.ssh/deploy_key.pub | tr -d '\n') CUSTOM_SSH_KEY_HOSTS=bitbucket.org,github.com
Deploy your app and enjoy!
Copy the snippet above into CLI.