@Fokko The only reason 2 versions are being installed is that I wanted to follow the CI process as close as it was [before merging the docker-ci changes](https://travis-ci.org/apache/incubator-airflow/builds/416219284). At the time, the tox target and the python version to be used were being matched (run a python3 tox target and run tox under python3), although I never understood the reason. We only use the system python to install tox.
I only remember coming across a single issue with a `PythonVirtualOperator` test failing [because of a version mismatch]( https://github.com/apache/incubator-airflow/pull/3393#discussion_r189708965) (tox running python3 and `PythonVirtualOperator` trying to use the system python, which could be python2), but if that happens, it should be simple to fix. [ Full content available at: https://github.com/apache/incubator-airflow/pull/3815 ] This message was relayed via gitbox.apache.org for [email protected]
