[GitHub] mik-laj opened a new pull request #4568: [AIRFLOW-3744] Abandon the use of obsolete aliases of methods

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mik-laj opened a new pull request #4568: [AIRFLOW-3744] Abandon the use of obsolete aliases of methods
URL: https://github.com/apache/airflow/pull/4568
 
 
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   ### Jira
   
     - https://issues.apache.org/jira/browse/AIRFLOW-3744
   
   ### Description
   
   New versions of Python have marked some methods as obsolete. This change replaces valid calls.
   https://docs.python.org/3/library/unittest.html#deprecated-aliases
   
   ### Tests
   
   Not applicable.
   
   ### Commits
   
   - [ ] 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
   
   Not applicable.
   
   ### Code Quality
   
   - [X] Passes `flake8`
   

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