try to add a Flake

flake.lock

@@ -0,0 +1,110 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1638122382,
+        "narHash": "sha256-sQzZzAbvKEqN9s0bzWuYmRaA03v40gaJ4+iL1LXjaeI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "74f7e4319258e287b0f9cb95426c9853b282730b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1601282935,
+        "narHash": "sha256-WQAFV6sGGQxrRs3a+/Yj9xUYvhTpukQJIcMbIi7LCJ4=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "588973065fce51f4763287f0fda87a174d78bf48",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "mach-nix": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs",
+        "pypi-deps-db": "pypi-deps-db"
+      },
+      "locked": {
+        "lastModified": 1637687243,
+        "narHash": "sha256-Qm0hPR9ZT1EP7lRW4udAPeb4yv6D2ONcw9ayterTP18=",
+        "owner": "DavHau",
+        "repo": "mach-nix",
+        "rev": "31b21203a1350bff7c541e9dfdd4e07f76d874be",
+        "type": "github"
+      },
+      "original": {
+        "owner": "DavHau",
+        "repo": "mach-nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1622797669,
+        "narHash": "sha256-xIyWeoYExzF0KNaKcqfxEX58fN4JTIQxTJWbsAujllc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1ca6b0a0cc38dbba0441202535c92841dd39d1ae",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1638587357,
+        "narHash": "sha256-2ySMW3QARG8BsRPmwe7clTbdCuaObromOKewykP+UJc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e34c5379866833f41e2a36f309912fa675d687c7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "pypi-deps-db": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1622970040,
+        "narHash": "sha256-u//RFnae/XMIhoy83G2uH2Qu/1LiUhVCdwwY1xj4Ufs=",
+        "owner": "DavHau",
+        "repo": "pypi-deps-db",
+        "rev": "be6591698c67a86a69c81fef72167e38d038a9fc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "DavHau",
+        "repo": "pypi-deps-db",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "mach-nix": "mach-nix",
+        "nixpkgs": "nixpkgs_2"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "A Python API for various tools I use at work.";
+  inputs = {
+    nixpkgs.url = github:NixOS/nixpkgs/nixos-21.11;
+    flake-utils.url = github:numtide/flake-utils;
+    mach-nix.url = "github:DavHau/mach-nix";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, mach-nix }:
+    with flake-utils.lib; eachSystem allSystems (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        base-requirements = builtins.readFile ./requirements/base.txt;
+        pyEnv = mach-nix.lib."${system}".mkPython {
+          requirements = base-requirements;
+        };
+      in
+      rec {
+        devShell = mach-nix.lib."${system}".mkPythonShell {
+          requirements = base-requirements + ''
+            flake8
+            autopep8
+            pytest
+            pytest-cov
+            pyinstaller
+          '';
+        };
+      });
+}