Fixing python output in a docker container

When you're executing python in a docker container you may encounter that all your output to stdout and/or stderr won't appear in the container logs. This is an output buffering problem. To fix it add PYTHONUNBUFFERED=0 to the environment. E.g. with this docker command:

docker run -e PYTHONUNBUFFERED=0 <yourimage>

Source:
http://stackoverflow.com/questions/23524976/capturing-output-of-python-script-run-inside-a-docker-container