[GitHub] [airflow] dhuang opened a new pull request #6793: [AIRFLOW-1076] Add get method for template variable accessor

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dhuang opened a new pull request #6793: [AIRFLOW-1076] Add get method for template variable accessor
URL: https://github.com/apache/airflow/pull/6793
 
 
   Support getting variables in templates by string. This is necessary when
   fetching variables with characters not allowed in a class attribute
   name. We can then also support returning default values when a variable does
   not exist.
   
   Original PR went stale, https://github.com/apache/airflow/pull/2223.
   
   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-1076
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
     - See above.
   
   ### Tests
   
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
     - Added unit tests for calling `var.value.get()` and `var.json.get()`, with or without default
   
   ### 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.
   

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