potiuk commented on issue #4483: [AIRFLOW-3673] Add official dockerfile URL: https://github.com/apache/airflow/pull/4483#issuecomment-454400526 One more comment - in our system tests we encountered a lot of troubles with differences of python 3.5 vs. 3.6. There are some subtle differences (the way how Popen.stdout returns bytes or strings etc. that make it work differently. And those were often caught at System Tests. I think there is a bit confusion with officially supported versions: in tox we have 3.5 and 2.7 but in Google Cloud Composer default python 3 version is 3.6. So I guess having 3 images 2.7, 3.5, 3.6 could be better than two 2/3 :).
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