with import <nixpkgs> {};
let
  arsenal = with python2Packages; buildPythonPackage {
    name = "arsenal-2.1";
    src = fetchurl {
      url = "https://files.pythonhosted.org/packages/40/67/fd96ebc8727b81bb8ffac07114681c6a20421458334930eff6d6a17f04a9/arsenal-2.1.tar.gz";
      sha256 = "1dj8x5dbbq6b4m0pmprjdy2gk9sckqw974hbrkj8zap56ydpy7vf";
    };
  };
in
(python2.buildEnv.override {
      ignoreCollisions = true;
      extraLibs = with python2Packages; [
        ipython
        matplotlib
        arsenal
      ];
    })