gistfile1.txt

=========== collect_data.py =============
#! /usr/bin/env nix-shell
#! nix-shell collect_data-environment.nix --command 'python3 collect_data.py'

here is python code



=========== default.nix ==============
with import <nixpkgs> { };

let 
  pkgs1 = import (pkgs.fetchFromGitHub {
    owner = "qknight";
    repo = "nixpkgs";
    rev = "a1dd8b2a5b035b758f23584dbf212dfbf3bff67d";
    sha256 = "1zn9znsjg6hw99mshs0yjpcnh9cf2h0y5fw37hj6pfzvvxfrfp9j";
  }) {};

in

pkgs1.python3Packages.buildPythonPackage rec {
  name = "crawler";
  version = "0.0.1";

  buildInputs = [ pkgs.firefox ];
  propagatedBuildInputs = with pkgs1.python3Packages; [
    virtual-display selenium
  ];

}