Installing `cartopy` `cmaps` `geocat.viz` `metpy` for a python Project

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1

I am trying to install some python dependencies for a project. I need to install the following dependencies: cartopy cmaps geocat.viz metpy.

I cannot install these dependencies because [NixOS Search](cartopy package) available on nix pacakage repo is broken. After searching through github repos I adjusted the build process to fix the broken by default cartopy dependency packaged for nix. See this. These are the instructions provided to install cartopy: Installation — cartopy 0.20.0 documentation

I cannot install cmaps because it is not available on the nix package repository. See this. The actual repo for the cmaps package is here: GitHub - hhuangwx/cmaps: user defined colormaps in matplotlib..

geocat.viz is not available on the nix package repo also. This is the source: GitHub - NCAR/geocat-viz: GeoCAT-viz contains tools to help plot geoscience data, including convenience and plotting functions that are used to facilitate plotting geosciences data with Matplotlib, Cartopy, and other visualization packages..

Finally metpy is the final dependency that needs to be installed with nix in order for this project to built out in a reproducible manner. metpy is also not available on the nix package repo but installation instructions is provided here: Install Guide — MetPy 1.6

Any help would be greatly appreciated in editing this flake.nix file in order to install these 4 dependencies.

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2

the cartopy issue has been fixed in python3Packages.cartopy: fix failing tests with proj 9.2 by kirillrdy · Pull Request #224135 · NixOS/nixpkgs · GitHub

1 Like
3

Thank you @kirillrdy, I appreciate all the help. The cartopy issue has been fixed.
However I am trying to get geocat.viz and cmaps installed using the buildPythonPackage function to build but I cannot get the python dependency to install using the following snippet in my flake

        geocat = inputs.nixpkgs.buildPythonPackage rec {
          pname = "geocat.viz";
          version = "0.9.1";
          src = inputs.nixpkgs.python3Packages.fetchPypi {
            inherit pname version;
            sha256 = "1hkyw2avwpj2f1qx2d2v9pf9xxr8r6f3j0bwq3l3gzb6w8ayppj1";
          };
        };

Error:

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Any idea on how I get these 3 dependencies installed.

4

default.nix

{}:
let
  nixpkgs = (fetchTarball "https://github.com/NixOS/nixpkgs/archive/0874168639713f547c05947c76124f78441ea46c.tar.gz");
  pkgs = import nixpkgs { };
  buildPythonPackage = pkgs.python3Packages.buildPythonPackage;
  fetchPypi = pkgs.python3Packages.fetchPypi;

  metpy = buildPythonPackage rec{
    pname = "MetPy";
    version = "1.4.1";
    src = fetchPypi {
      inherit pname version;
      hash = "sha256-oT3S2jYOv9hWJw5BdG5P1Uutyp3NvYASKegDgs4x27k=";
    };
    propagatedBuildInputs = with pkgs.python3Packages ;[ setuptools_scm pyproj numpy xarray pint scipy traitlets pooch matplotlib ];
  };
  cmaps = buildPythonPackage rec{
    pname = "cmaps";
    version = "1.0.5";
    src = fetchPypi {
      inherit pname version;
      hash = "sha256-jucIv2xAJNzQYNZYqgy7p0CsBHLlY4UStHZN6h6SjEY=";
    };
    propagatedBuildInputs = with pkgs.python3Packages ;[ numpy matplotlib ];
  };

  goecat-viz = pkgs.python3Packages.buildPythonPackage rec {
    pname = "geocat.viz";
    version = "2022.7.0";
    src = pkgs.python3Packages.fetchPypi {
      inherit pname version;
      sha256 = "sha256-7iBZitt+A/BJVsBahlVAtUfps1b0jKBBsqpPWBoqhPI=";
    };
    propagatedBuildInputs = with pkgs.python3Packages; [ cmaps metpy cartopy xarray scikit-learn pint traitlets pooch ];
  };
in
pkgs.mkShell {
  pname = "geocat-shell";
  buildInputs = [
    (pkgs.python3.withPackages (ps: [ goecat-viz ]))
  ];
}

nix-shell
python3
Python 3.9.16 (main, Dec  6 2022, 18:36:13) 
[GCC 11.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import geocat.viz

hopefully this works for you, and you can incorporate it into your flake

1 Like
5

Thank you, I appreciate that