[Nix-dev] matplotlib not found by python

[Andrew Fraser]

Hi,

Last month, I asked for help as I built the nix package system and
installed it in a non-standard location.  Thanks for that help.  Once
I understand nix a little better, I hope to modify the wiki page about
installing nix in a home directory and answer a few questions others
have asked.

I write today to ask for help getting matplotlib running.

Here is the list of packages that I've installed:

    krunk at cathcart:~$ nix-env -q
    emacs-24.5
    emacs-auctex-11.87.7
    emacs-magit-2.3.1
    git-2.7.0
    hello-2.10
    nix-1.10
    python-2.7.11
    python2.7-ipython-4.0.0
    python2.7-matplotlib-1.5.0
    python2.7-numpy-1.10.2
    python2.7-scipy-0.16.1
    python3-3.5.1
    python3.5-ipython-4.0.0
    python3.5-matplotlib-1.5.0
    python3.5-numpy-1.10.2
    python3.5-scipy-0.16.1
    texlive-combined-full-2015
    krunk at cathcart:~$ 

And here is the error that I must resolve:

    krunk at cathcart:~$ python
    Python 2.7.11 (default, Jan 01 1970, 00:00:01) 
    [GCC 4.9.3] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import matplotlib
    Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    ImportError: No module named matplotlib
    >>> 

In my packages directory I find:

    krunk at cathcart:/local/nixpkgs$ git remote -v
    origin	https://github.com/NixOS/nixpkgs.git (fetch)
    origin	https://github.com/NixOS/nixpkgs.git (push)
    krunk at cathcart:/local/nixpkgs$ 

The fact (quoted from history|grep nix) that I issued the following
command to enable me to install ipython may be relevant:

  331  nix-env --set-flag priority 6 python-2.7.11
  332  time nix-env -j20 --cores 0 -i python3-3.5.1

Also relevant may be the fact that I installed matplotlib last with:

  360  time nix-env -j20 --cores 0 -i python2.7-matplotlib-1.5.0 python3.5-matplotlib-1.5.0

Thanks for any advice,

Andy