min nix-pakke:)

.envrc

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+use nix

shell.nix

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+with import (fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-25.11") { };
+mkShellNoCC rec {
+  packages = [
+    # Defines a python + set of packages.
+    (python3.withPackages (
+      ps: with ps; [
+        jupyter
+        ipython
+        pandas
+        numpy
+        matplotlib
+        scipy
+        netcdf4
+        xarray
+        shapely
+
+        # Uncomment the following lines to make them available in the shell.
+        # Additional packages can be found with: https://search.nixos.org/packages
+        # pandas
+        # numpy
+        # matplotlib
+      ]
+    ))
+  ];
+
+  buildInputs = [
+    stdenv.cc.cc
+    netcdf
+  ];
+
+  PYTHONPATH = "$PWD";
+  #MPLBACKEND = "Agg";
+  LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath buildInputs;
+
+  # Automatically run jupyter when entering the shell.
+  # shellHook = "jupyter notebook";
+}