Fokko edited a comment on issue #5020: [AIRFLOW-4200][AIP-3-subtask-4] Remove all __future__ imports URL: https://github.com/apache/airflow/pull/5020#issuecomment-483038193 It looks like the K8s tests still use Python 2.7: ``` + airflow initdb Traceback (most recent call last): File "/usr/local/bin/airflow", line 21, in <module> from airflow import configuration File "/usr/local/lib/python2.7/dist-packages/airflow/__init__.py", line 36, in <module> from airflow import settings, configuration as conf File "/usr/local/lib/python2.7/dist-packages/airflow/settings.py", line 32, in <module> from airflow.utils.sqlalchemy import setup_event_handlers File "/usr/local/lib/python2.7/dist-packages/airflow/utils/sqlalchemy.py", line 22, in <module> import json File "/usr/local/lib/python2.7/dist-packages/airflow/utils/json.py", line 27, in <module> class AirflowJsonEncoder(json.JSONEncoder): AttributeError: 'module' object has no attribute 'JSONEncoder' ```
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