add dev environment

flake.lock

@@ -0,0 +1,42 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1762756533,
+        "narHash": "sha256-HiRDeUOD1VLklHeOmaKDzf+8Hb7vSWPVFcWwaTrpm+U=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c2448301fb856e351aab33e64c33a3fc8bcf637d",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-25.05",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_unstable": {
+      "locked": {
+        "lastModified": 1762844143,
+        "narHash": "sha256-SlybxLZ1/e4T2lb1czEtWVzDCVSTvk9WLwGhmxFmBxI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9da7f1cf7f8a6e2a7cb3001b048546c92a8258b4",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "nixpkgs_unstable": "nixpkgs_unstable"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,23 @@
+{
+  description = "Shell with python dev environment";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-25.05";
+    nixpkgs_unstable.url = "nixpkgs/nixos-unstable";
+  };
+
+  outputs =
+    { nixpkgs, nixpkgs_unstable, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+      pkgs_ustbl = nixpkgs_unstable.legacyPackages.${system};
+    in
+    {
+      devShells.${system}.default = nixpkgs.legacyPackages.${system}.mkShell {
+        buildInputs = [
+          pkgs.python311
+        ];
+      };
+    };
+}