It is better to explicitly set docker image tag, e.g:
Otherwise, it is unpredictable, which image version will be base.
Every time Docker uses the latest base image. Here it is python 2.7 base image, as it is official, You can run the container and can check it ;)
BTW thanks for your feedback
No, python:latest stays for python:3.6, you can see it on Dockehub: library/python
Thank you for correcting me. I updated the post :)
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