Package and ship relocatable python virtual environments, like a boss.
Terrarium will package up and compress a virtualenv for you based on pip requirements and then let you ship that environment around. Do the complex dependency math one time and then every subsequent install is basically at the speed of file transfer + decompression.
Pip and virtualenv are awesome, but pip is not designed to allow consistent and reproducible updates of existing environments. Pip is also a general installation tool, meaning that it's not near as fast as shipping around compressed source code. This means that even if you have well-made requirements files, your pip-based deploys are either slow or inconsistent.
To get started using terrarium, see the Quick Start guide.