fralalonde commented on issue #3849: [AIRFLOW-3009] Fix Python 3.7 deprecation warning for import collections abc URL: https://github.com/apache/incubator-airflow/pull/3849#issuecomment-418707012 Good point. Updated to preserve backward compatibility with Python versions [prior to 3.3](https://docs.python.org/3.3/library/collections.abc.html)
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