ashb opened a new pull request #7517: [AIRFLOW-6817] Lazy-load `airflow.DAG` to keep user-facing API untouched URL: https://github.com/apache/airflow/pull/7517 `from airflow import DAG` is _such_ a common pattern that it's worth making sure this stays working. Since we are now on Python 3 we can use PEP-562 to have officially supported lazy-loading of attributes on a module. Since the example_dags will be referred to/copied by users I have updated them all back to import from the airflow module, but have left any internal uses untouched. This approach taken from Celery: https://github.com/celery/celery/blob/f2ddd894c32f642a20f03b805b97e460f4fb3b4f/celery/__init__.py#L63-L78 --- Issue link: WILL BE INSERTED BY [boring-cyborg](https://github.com/kaxil/boring-cyborg) Make sure to mark the boxes below before creating PR: [x] - [x] Description above provides context of the change - [x] Commit message/PR title starts with `[AIRFLOW-NNNN]`. AIRFLOW-NNNN = JIRA ID<sup>*</sup> - [x] Unit tests coverage for changes (not needed for documentation changes) - [x] Commits follow "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)" - [x] Relevant documentation is updated including usage instructions. - [x] I will engage committers as explained in [Contribution Workflow Example](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#contribution-workflow-example). <sup>*</sup> For document-only changes commit message can start with `[AIRFLOW-XXXX]`. --- In case of fundamental code change, Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)) is needed. In case of a new dependency, check compliance with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x). In case of backwards incompatible changes please leave a note in [UPDATING.md](https://github.com/apache/airflow/blob/master/UPDATING.md). Read the [Pull Request Guidelines](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#pull-request-guidelines) for more information.
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