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## Test and Deploy Python application to Heroku
This example will guide you how to run tests in your Python application and deploy it automatiacally to staging and production Heroku application.
You can check the [source](https://gitlab.com/ayufan/python-getting-started) and [CI status](https://ci.gitlab.com/projects/4080).
### Configure project
This is how the configuration (the `.gitlab-ci.yml`) for that project looks like:
```yaml
test:
script:
# this configures django application to use attached postgres database that is run on `postgres` host
- export DATABASE_URL=postgres://postgres:@postgres:5432/python-test-app
- apt-get update -qy
- apt-get install -y python-dev python-pip
- pip install -r requirements.txt
- python manage.py test
staging:
type: deploy
script:
- apt-get update -qy
- apt-get install -y ruby-dev
- gem install dpl
- dpl --provider=heroku --app=gitlab-ci-python-test-staging --api-key=$HEROKU_STAGING_API_KEY
only:
- master
production:
type: deploy
script:
- apt-get update -qy
- apt-get install -y ruby-dev
- gem install dpl
- dpl --provider=heroku --app=gitlab-ci-python-test-prod --api-key=$HEROKU_PRODUCTION_API_KEY
only:
- tags
```
This project has three jobs:
1. `test` - used to test rails application,
2. `staging` - used to automatically deploy staging environment every push to `master` branch
3. `production` - used to automatically deploy production environmnet for every created tag
### Store API keys
You'll need to create two variables in `Project > Variables`:
1. `HEROKU_STAGING_API_KEY` - Heroku API key used to deploy staging app,
2. `HEROKU_PRODUCTION_API_KEY` - Heroku API key used to deploy production app.
Find your Heroku API key in [Manage Account](https://dashboard.heroku.com/account).
### Create Heroku application
For each of your environments, you'll need to create a new Heroku application.
You can do this through the [Dashboard](https://dashboard.heroku.com/).
### Create runner
First install [Docker Engine](https://docs.docker.com/installation/).
To build this project you also need to have [GitLab Runner](https://about.gitlab.com/gitlab-ci/#gitlab-runner).
ou can use public runners available on `ci.gitlab.com`, but you can register your own:
```
gitlab-ci-multi-runner register \
--non-interactive \
--url "https://ci.gitlab.com/" \
--registration-token "PROJECT_REGISTRATION_TOKEN" \
--description "python-3.2" \
--executor "docker" \
--docker-image python:3.2 \
--docker-postgres latest
```
Above command creates runner that uses [Docker](https://docker.com/), uses [python:3.2](https://registry.hub.docker.com/u/library/python/) image and uses [postgres](https://registry.hub.docker.com/u/library/postgres/) database.
To access PostgreSQL database you need to connect to `host: postgres` as user `postgres` without password.
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