Creates a nix-shell environnement for installing apps using pip install

default.nix

with import <nixpkgs> {};
stdenv.mkDerivation rec {
  name = "random-project";

  buildInputs = [
    python
    python37Packages.virtualenv
  ];

  env = buildEnv { name = name; paths = buildInputs; };

  shellHook = ''
    export SOURCE_DATE_EPOCH=315532800
    virtualenv .env
    source .env/bin/activate
    pip install -r requirements.txt
  '';
}