Issue description

I can't use standard terminal keys in the python from nixpkgs.

Steps to reproduce

1. nix-shell -p python
2. python
3. Enter 5 + 5
4. Press the up arrow.
5. Weep when you see ^[[A
6. Press the left arrow
7. Weep when you see ^[[D
8. Press ctrl-A
9. Weep when you see ^A

Technical details

I tried it on darwin nixpkgs and on NixOS:

• NixOS version: 16.03pre73316.93d8671 (Emu)
• Darwin Nixpkgs version: 16.09pre87549.8a1e7cd