First real commit

python/.envrc

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+nix_direnv_watch_file requirements.txt
+use flake

python/.gitignore

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+__pycache__
+
+/.direnv

python/README.md

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+# python-shell
+
+## Using
+
+- dev shell: `nix develop`
+- edit `requirements.txt` for dev shell requirements
+
+## Jupyter in VSCode
+
+To use jupyter in VSCode add these requirements:
+
+```
+ipykernel
+nbformat
+ipywidgets
+```
+
+## Updating mach-nix pypi deps db
+
+Add to inputs:
+
+```nix
+pypi-deps-db = {
+  url = "github:davhau/pypi-deps-db/0000000000000000000000000000000000000000";
+  flake = false;
+};
+mach-nix.inputs.pypi-deps-db.follows = "pypi-deps-db";
+```
+
+## Adding git dependency
+
+Add to mkPython ([more info](https://github.com/DavHau/mach-nix/blob/master/examples.md)):
+
+```nix
+packagesExtra = [
+  (mach.buildPythonPackage
+    {
+      src = builtins.fetchGit {
+        url = "https://github.com/user/repo";
+        ref = "branch";
+        rev = "0000000000000000000000000000000000000000";
+      };
+    })
+];
+```

python/flake.nix

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+{
+  description = "Python shell flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+
+    mach-nix.url = "github:davhau/mach-nix";
+  };
+
+  outputs = { self, nixpkgs, mach-nix, flake-utils, ... }:
+    let
+      pythonVersion = "python39";
+    in
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        mach = mach-nix.lib.${system};
+
+        pythonEnv = mach.mkPython {
+          python = pythonVersion;
+          requirements = builtins.readFile ./requirements.txt;
+        };
+      in
+      {
+        devShells.default = pkgs.mkShellNoCC {
+          packages = [ pythonEnv ];
+
+          shellHook = ''
+            export PYTHONPATH="${pythonEnv}/bin/python"
+          '';
+        };
+      }
+    );
+}

python/main.py

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+#!/usr/bin/env python
+
+print("Hello world!")