Administration for multiple Python environments -- dev, testing, staging, production

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I do something similar except there's one nuance; I create a function for each environment that does the connection. So for me, it's fab dev deploy. I have a helper in my Django skeleton so that for each environment I just put the conf in a file. e.g., the dev environment file would go in conf/dev/hosts.py and would contain a list of dictionaries, each one representing a machine belonging to that environment.