Put a PyPI package name in, get a Nix expression out to add to nixpkgs or your private build scripts.

• Choose your favorite package from PyPI (like https://pypi.python.org/pypi/thumbor)
• Feed its name to python2nix: python -mpython2nix thumbor
• Use code from stdout as the base for Nix expression (it may need manual tweaks).

• Tested only with pip==1.5.6.
• May ignore lots of the metadata (e.g. doesn't handle tests_require).

• @bjornfor
• @domenkozar
• @phunehehe
• @proger

• @tailhook's reqtxt2nix which lets you produce build environments (put your requirements.txt in, get a myEnvFun out)