anchor.diff: -{ stdenv, buildPythonPackage, fetchPypi, fetchpatch, glibcLocales, mock, pytest, botocore,
  +{ stdenv, buildPythonPackage, fetchPypi, glibcLocales, mock, pytest, botocore,
     testfixtures, pillow, six, twisted, w3lib, lxml, queuelib, pyopenssl,
     service-identity, parsel, pydispatcher, cssselect, lib }:
   buildPythonPackage rec {
  -  version = "1.7.1";
  +  version = "1.7.2";
     pname = "Scrapy";
   
     checkInputs = [ glibcLocales mock pytest botocore testfixtures pillow ];
  
positive.code:     # root and readonly. As a consequence scrapy can't edit the
      # project templates.
      ./permissions-fix.patch
  
      # Fix configparser import for python2. See: https://github.com/scrapy/scrapy/pull/3887
      (fetchpatch {
        url = "https://github.com/scrapy/scrapy/commit/21345dc9ec60dcc1cd2e5c0eace5788aa502ce23.patch";
        sha256 = "09834rcjyggvyj6zignvfga2xbqkknygly5p4a96k2mvz0xn3v6z";
      })
    ];
  
    LC_ALL="en_US.UTF-8";
  
negative.code: 
    src = fetchPypi {
      inherit pname version;
      sha256 = "7a4ed68cfb44dc86e1895f0fb46257ee4adb1090754ac21faec205763f054464";
    };
  
    postInstall = ''
  