title: What's the difference between Docker and Python virtualenv?
body: <p>From what I understand about Docker, it's a tool used for virtual environments. In their lingo, its called "containerization". This is more or less what Python's virtualenv does. However, you can use virtualenv <em>in</em> Docker. So, is it a virtual environment inside a virtual environment? I'm confused as to how this would even work, so could someone please clarify?</p>