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[AIRFLOW-3375] Support returning multiple tasks with BranchPythonOperator #4215

merged 1 commit into from Nov 21, 2018


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BasPH commented Nov 20, 2018

Make sure you have checked all steps below.


  • My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"


  • Here are some details about my PR, including screenshots of any UI changes:

This PR adds support to the BranchPythonOperator for handling a list of tasks, so multiple branches can be returned. A single task_id string is still supported.

This is now possible with this PR:

By returning a list of task ids:
BranchPythonOperator(task_id='your_dag', dag=dag, python_callable=lambda: ['branch_1', 'branch_2'])


  • My PR adds the following unit tests OR does not need testing for this extremely good reason:

Added test_branch_list_without_dag_run test to BranchOperatorTest.


  • 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":
    1. Subject is separated from body by a blank line
    2. Subject is limited to 50 characters (not including Jira issue reference)
    3. Subject does not end with a period
    4. Subject uses the imperative mood ("add", not "adding")
    5. Body wraps at 72 characters
    6. Body explains "what" and "why", not "how"


  • In case of new functionality, my PR adds documentation that describes how to use it.
    • When adding new operators/hooks/sensors, the autoclass documentation generation needs to be added.

Added new functionality in parentheses.

Code Quality

  • Passes flake8

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codecov-io commented Nov 20, 2018

Codecov Report

Merging #4215 into master will increase coverage by <.01%.
The diff coverage is 100%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master    #4215      +/-   ##
+ Coverage   77.82%   77.82%   +<.01%     
  Files         201      201              
  Lines       16339    16341       +2     
+ Hits        12716    12718       +2     
  Misses       3623     3623
Impacted Files Coverage Δ
airflow/operators/ 95.09% <100%> (+0.06%) ⬆️

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Fokko approved these changes Nov 21, 2018

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Fokko left a comment

Love it @BasPH. Thanks!

@Fokko Fokko merged commit ad2c968 into apache:master Nov 21, 2018

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tmiller-msft added a commit to cse-airflow/incubator-airflow that referenced this pull request Nov 27, 2018

elizabethhalper added a commit to cse-airflow/incubator-airflow that referenced this pull request Dec 7, 2018

aliceabe pushed a commit to aliceabe/incubator-airflow that referenced this pull request Jan 3, 2019

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