[GitHub] [airflow] tirkarthi opened a new pull request #5533: [AIRFLOW-4895] Import Iterable from collections.abc to fix DeprecationWarning in Python 3.7

[GitBox <gi...@apache.org>]

tirkarthi opened a new pull request #5533: [AIRFLOW-4895] Import Iterable from collections.abc to fix DeprecationWarning in Python 3.7
URL: https://github.com/apache/airflow/pull/5533
 
 
   ### Jira
   
   - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title.
   
   ### Description
   
   Import Iterable from collections.abc to fix DeprecationWarning in Python 3.7. Use collections to ensure compatibility for Python 3.3 and below.
   
   ### Tests
   
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   This fixes a DeprecationWarning and doesn't make code change
   
   ### 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"
   
   ### Code Quality
   
   - [x] Passes `flake8`
   

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