[jira] [Commented] (AIRFLOW-4835) Refactor template rendering functions

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-4835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16870603#comment-16870603 ] 

ASF GitHub Bot commented on AIRFLOW-4835:
-----------------------------------------

BasPH commented on pull request #5461: [AIRFLOW-4835] Refactor render_template
URL: https://github.com/apache/airflow/pull/5461
 
 
   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-4835
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   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   
   I got started on making [airflow/models Pylint compatible](https://issues.apache.org/jira/browse/AIRFLOW-4678), and bumped into the render_template function(s) which were real hard to understand at first sight. Because of the large change required to improve it, I decided to split it off in a separate PR.
   
   This PR:
   
   - Refactors `BaseOperator.render_template()` and removes `render_template_from_field()`. The functionality could be greatly simplified into a single `render_template()` function.
   - Removes six usage.
   - Performance-wise not much besides removing two `hasattr` calls.
   - Removes the argument `attr` to `render_template()` which wasn't used.
   - Squashes multiple similar tests into two parameterized tests.
   - Adheres to 110 line length.
   - Adds Pydoc.
   - Adds typing.
   
   ### Tests
   
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   No unit tests added, but multiple similar tests merged into a single, parameterized, test.
   
   ### 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
   
   ### Code Quality
   
   - [x] Passes `flake8`
   
 
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> Refactor template rendering functions
> -------------------------------------
>
>                 Key: AIRFLOW-4835
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-4835
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 2.0.0
>            Reporter: Bas Harenslak
>            Priority: Major
>




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