anchor.diff:      substituteInPlace setup.py \
         --replace "click~=7.1.1" "click" \
         --replace "click-default-group~=1.2.2" "click-default-group" \
  -      --replace "Jinja2~=2.10.3" "Jinja2" \
         --replace "hupper~=1.9" "hupper" \
         --replace "pint~=0.9" "pint" \
  -      --replace "pluggy~=0.13.0" "pint" \
  +      --replace "pluggy~=0.13.0" "pluggy" \
         --replace "uvicorn~=0.11" "uvicorn" \
  -      --replace "aiofiles~=0.4.0" "aiofiles" \
  -      --replace "janus~=0.4.0" "janus" \
         --replace "PyYAML~=5.3" "PyYAML"
     '';
   
  -  # many tests require network access
  +  # test_html is very slow
     # test_black fails on darwin
     dontUseSetuptoolsCheck = true;
     pytestFlagsArray = [
  -    "--ignore=tests/test_api.py"
  -    "--ignore=tests/test_csv.py"
       "--ignore=tests/test_html.py"
       "--ignore=tests/test_docs.py"
       "--ignore=tests/test_black.py"
  
positive.code: 
  buildPythonPackage rec {
    pname = "datasette";
    version = "0.39";
  
    src = fetchFromGitHub {
      owner = "simonw";
      repo = "datasette";
      rev = version;
      sha256 = "07d46512bc9sdan9lv39sf1bwlf7vf1bfhcsm825vk7sv7g9kczd";
    };
  
    nativeBuildInputs = [ pytestrunner ];
  
    propagatedBuildInputs = [
      aiofiles
      click
      click-default-group
      janus
      jinja2
      hupper
      pint
      pluggy
      uvicorn
      setuptools
    ];
  
negative.code:     pytest-asyncio
      aiohttp
      beautifulsoup4
      asgiref
    ];
  
  