fralalonde opened a new pull request #3849: [AIRFLOW-3009] Fix Python 3.7 deprecation warning for import collections abc URL: https://github.com/apache/incubator-airflow/pull/3849 This is a fix for https://issues.apache.org/jira/browse/AIRFLOW-3009 After pip-installing Airflow from source, the following warning message appears upon entering any airflow command from the prompt: ``` /usr/lib/python3.7/site-packages/airflow/models.py:29: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop workingfrom collections import namedtuple, defaultdict, Hashable ```
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