We just commit our dependencies into our project repository in wheel format and install into a virtual env on prod from that directory eliminating PyPi. Though I don't know many other that do this. Do you?

Bitbucket and GitHub are reliable enough for how often we deploy that we aren't all that worried about downtime from those services. We could also pull from a dev's machine should the situation be that dire.

We have looked into Docker but that tool has a lot more growing before "I" would feel comfortable putting it into production. I would rather ship a packaged VM than Docker at this point, there are to many gotchas that we don't have time to figure out.