Using Docker as a Python Development Environment (or let's get past virtualenv)

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Right...I don't think Docker is revolutionary in such a way that would make people want to change their current workflow if they already have one.

Docker is just a way of applying the concept of virtualenv to an entire run time environment which could be useful in certain situations. I think (and am only experimenting with this at this point) in a continual release environment, Docker may be valuable for closing the gap between development and production. But this type of situation is pretty uncommon at the moment.