anchor.diff:      six twisted w3lib lxml cssselect queuelib pyopenssl service-identity parsel pydispatcher
     ];
   
  -  # Scrapy is usually installed via pip where copying all
  -  # permissions makes sense. In Nix the files copied are owned by
  -  # root and readonly. As a consequence scrapy can't edit the
  -  # project templates.
  -  patches = [ ./permissions-fix.patch ];
  +  patches = [
  +    # Scrapy is usually installed via pip where copying all
  +    # permissions makes sense. In Nix the files copied are owned by
  +    # root and readonly. As a consequence scrapy can't edit the
  +    # project templates.
  +    ./permissions-fix.patch
  +    # fix python37 issues. Remove with the next release
  +    (fetchpatch {
  +      url = https://github.com/scrapy/scrapy/commit/f4f39057cbbfa4daf66f82061e57101b88d88d05.patch;
  +      sha256 = "1f761qkji362i20i5bzcxz44sihvl29prm02i5l2xyhgl1hp91hv";
  +    })
  +  ];
   
     LC_ALL="en_US.UTF-8";
   
  +  # Ignore proxy tests because requires mitmproxy
  +  # Ignore test_retry_dns_error because tries to resolve an invalid dns and weirdly fails with "Reactor was unclean"
  +  # Ignore xml encoding test on darwin because lxml can't find encodings https://bugs.launchpad.net/lxml/+bug/707396
     checkPhase = ''
  -    py.test --ignore=tests/test_linkextractors_deprecated.py --ignore=tests/test_proxy_connect.py ${lib.optionalString stdenv.isDarwin "--ignore=tests/test_utils_iterators.py"}
  -    # The ignored tests require mitmproxy, which depends on protobuf, but it's disabled on Python3
  -    # Ignore iteration test, because lxml can't find encodings on darwin https://bugs.launchpad.net/lxml/+bug/707396
  +    pytest --ignore=tests/test_linkextractors_deprecated.py --ignore=tests/test_proxy_connect.py --deselect tests/test_crawl.py::CrawlTestCase::test_retry_dns_error ${lib.optionalString stdenv.isDarwin "--deselect tests/test_utils_iterators.py::LxmlXmliterTestCase::test_xmliter_encoding"}
     '';
   
     src = fetchPypi {
  
positive.code:     sha256 = "5a398bf6818f87dcc817c919408a195f19ba46414ae12f259119336cfa862bb6";
    };
  
    meta = with lib; {
      description = "A fast high-level web crawling and web scraping framework, used to crawl websites and extract structured data from their pages";
      homepage = https://scrapy.org/;
      license = licenses.bsd3;
      maintainers = with maintainers; [ drewkett ];
      platforms = platforms.unix;
    };
  }
  
negative.code: { stdenv, buildPythonPackage, fetchPypi, glibcLocales, mock, pytest, botocore,
    testfixtures, pillow, six, twisted, w3lib, lxml, queuelib, pyopenssl,
    service-identity, parsel, pydispatcher, cssselect, lib, fetchpatch }:
  buildPythonPackage rec {
    version = "1.5.1";
    pname = "Scrapy";
  