gistfile1.txt

let 
  pkgs = import <nixpkgs> {}; 
in
with pkgs;
let 
  mypython = pkgs.python36;
  ppkgs = mypython.pkgs;
  
  cfscrape = with ppkgs; callPackage ~/src/nixpkgs/cfscrape {};
  dateparser = with ppkgs; callPackage ~/src/nixpkgs/dateparser {};
  langdetect = with ppkgs; callPackage ~/src/nixpkgs/langdetect {};
  pdftotext = with ppkgs; callPackage ~/src/nixpkgs/pdftotext {};
  sqlitedict = with ppkgs; callPackage ~/src/nixpkgs/sqlitedict {};
  requests-aws4auth = with ppkgs; callPackage ~/src/nixpkgs/requests-aws4auth {};
  scrapinghub = with ppkgs; callPackage ~/src/nixpkgs/scrapinghub {};
  scrapy-crawlera = with ppkgs; callPackage ~/src/nixpkgs/scrapy-crawlera {};
  docker-py = with ppkgs; callPackage ~/src/nixpkgs/docker-py { };
  shub = with ppkgs; callPackage ~/src/nixpkgs/shub { inherit docker-py scrapinghub; };
  
  my-packages = python-packages: with python-packages; 
  [
    virtualenvwrapper
    cffi
    boto3
    beautifulsoup4
    cfscrape
    dateparser
    elasticsearch
    jinja2
    langdetect
    moto
    msgpack-python
    pdftotext
    requests-aws4auth
    scrapy-crawlera
    scrapy
    shub
    sqlitedict
    voluptuous
    click
  ]; 
  in ((mypython.withPackages (my-packages)).override (args: { ignoreCollisions = true; })).env