Initial commit

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1721949857,
+        "narHash": "sha256-DID446r8KsmJhbCzx4el8d9SnPiE8qa6+eEQOJ40vR0=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "a1cc729dcbc31d9b0d11d86dc7436163548a9665",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A Python project";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    system = "x86_64-linux";
+    pkgs = import nixpkgs {inherit system;};
+
+    my-python = pkgs.python3.withPackages (ps: [ps.numpy]);
+  in {
+    formatter.${system} = pkgs.alejandra;
+
+    devShells.${system} = {
+      default = self.devShells.${system}.foo;
+      foo = pkgs.mkShell {
+        packages = with pkgs; [
+          my-python
+        ];
+      };
+    };
+
+    packages.${system} = {
+      default = self.packages.${system}.hello;
+      hello = pkgs.writeShellScriptBin "hello" ''
+        ${pkgs.python3}/bin/python ${./main.py}
+      '';
+    };
+  };
+}

main.py

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+print('Hello from Python')

result

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+/nix/store/zln9b7yardd69mvqb9fap5wh1hkkdgp2-hello