Nix

Development shell with Python 3.12

{
  description = "A very basic flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
        };
      in
      with pkgs;
      {
        devShells.default = mkShell {
          buildInputs = [
            python312
            python312Packages.pip
          ];
        };
      }
    );
}