potiuk opened a new pull request #6596: [AIRFLOW-6004] Untangle Executors class to avoid cyclic imports URL: https://github.com/apache/airflow/pull/6596 There are cyclic imports detected seemingly randomly by pylint checks when some of the PRs are run in CI: ************* Module airflow.utils.log.json_formatter airflow/utils/log/json_formatter.py:1:0: R0401: Cyclic import (airflow.executors -> airflow.executors.kubernetes_executor -> airflow.kubernetes.pod_generator) (cyclic-import) airflow/utils/log/json_formatter.py:1:0: R0401: Cyclic import (airflow -> airflow.executors -> airflow.executors.kubernetes_executor -> airflow.kubernetes.pod_launcher) (cyclic-import) airflow/utils/log/json_formatter.py:1:0: R0401: Cyclic import (airflow.executors -> airflow.executors.kubernetes_executor -> airflow.kubernetes.worker_configuration -> airflow.kubernetes.pod_generator) (cyclic-import) The problem is that airflow's _init_ contains a few convenience imports (AirflowException, Executors etc.) but it also imports a number of packages (for example kubernetes_executor) that in turn import the airflow package objects - for example airflow.Executor. This leads to cyclic imports if you import first the executors before airflow. Similar problem happens with executor._init_.py containing class "Executors" imported by all executors but at the same time some of the executors (for example KubernetesExecutor) import the very same Executor class. This might happen in pylint checks in pre-commit because they split a number of files they process between the multiple threads you have at your machine and sometimes it might happen that the files are imported in different order. As a solution, the executors "list" should be moved to a separate module. Also the name of constants was changed to not to be confused with class names and Executors class was renamed to AvailableExecutors. Make sure you have checked _all_ steps below. ### Jira - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR" - https://issues.apache.org/jira/browse/AIRFLOW-6004 ### Description - [x] Here are some details about my PR, including screenshots of any UI changes: ### Tests - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: ### Commits - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 1. Subject is limited to 50 characters (not including Jira issue reference) 1. Subject does not end with a period 1. Subject uses the imperative mood ("add", not "adding") 1. Body wraps at 72 characters 1. Body explains "what" and "why", not "how" ### Documentation - [x] In case of new functionality, my PR adds documentation that describes how to use it. - All the public functions and the classes in the PR contain docstrings that explain what it does - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
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