ipython broken on python2.7

[LnL7]

Issue description

The ipython update introduced in 60eaa47 only supports for python3.

/cc @FRidh

Steps to reproduce

$ nix-shell -p pythonPackages.ipython
error: ipython-6.0.0 not supported for interpreter python2.7

Technical details

• Nixpkgs version: (9e764af)

[FRidh]

That's because from 6.0.0 on upstream only supports 3.3 and up. See the mail I sent about it earlier.

[LnL7]

Yes, but shouldn't we keep a 5.x version around? python2.7 is still the default version in nixpkgs.

[FRidh]

If someone wants to add and support it I suppose they could add it. I wonder how long having multiple packages will work though due to upgrades of dependencies.