added nix flake

flake.nix

@@ -0,0 +1,44 @@
+{
+  description = "Python development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    nixpkgs-python.url = "github:cachix/nixpkgs-python";
+  };
+
+  outputs = { self, nixpkgs, nixpkgs-python }: 
+    let
+      system = "x86_64-linux";
+      # system = "x86_64-rwin";
+
+      pythonVersion = "3.10.1";
+
+
+      pkgs = import nixpkgs { inherit system; };
+      myPython = nixpkgs-python.packages.${system}.${pythonVersion};
+    in
+    {
+      devShells.${system}.default = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          zlib        
+          libgcc
+             stdenv.cc.cc.lib
+             (python3.withPackages(ps: with ps; [
+            ipython
+            jupyter
+            numpy
+            pandas
+            plotly
+          ]))
+        ];
+        packages = [
+          myPython
+        ];
+        shellHook = ''
+          python --version
+          exec fish
+          . ./.venv/bin/activate.fish
+        '';
+      };
+    };
+}