Devshell flake importing a Python environment (based on https://github.com/numtide/devshell/issues/136)

flake.nix

{
  description = "virtual environments";

  inputs.devshell.url = "github:numtide/devshell";
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, flake-utils, devshell, nixpkgs }:
    flake-utils.lib.eachDefaultSystem (system: {
      devShell =
        let
          pkgs = import nixpkgs {
            inherit system;
            overlays = [ devshell.overlays.default ];
          };

        in pkgs.devshell.mkShell {
          # Follow https://numtide.github.io/devshell/modules_schema.html for some directives
          #imports = [ (pkgs.devshell.importTOML ./devshell.toml) ];
          devshell.packages = with pkgs; [
            (python311.withPackages(p: with p; [ pandas ]))
          ];
        };
    });
}