anchor.diff:  let
     py = python.override {
       packageOverrides = self: super: {
  -      aws-sam-translator = super.aws-sam-translator.overridePythonAttrs (oldAttrs: rec {
  -        version = "1.25.0";
  -        src = oldAttrs.src.override {
  -          inherit version;
  -          sha256 = "08756yl5lpqgrpr80f2b6bdcgygr37l6q1yygklcg9hz4yfpccav";
  -        };
  -      });
  -
         flask = super.flask.overridePythonAttrs (oldAttrs: rec {
           version = "1.0.2";
           src = oldAttrs.src.override {
  
positive.code:   # fix over-restrictive version bounds
    postPatch = ''
      substituteInPlace requirements/base.txt \
        --replace "boto3~=1.13.0, >=1.13.0" "boto3~=1.14.3" \
        --replace "serverlessrepo==0.1.9" "serverlessrepo~=0.1.9" \
        --replace "python-dateutil~=2.6, <2.8.1" "python-dateutil~=2.6" \
        --replace "jmespath~=0.9.5" "jmespath~=0.10.0" \
        --replace "tomlkit==0.5.8" "tomlkit~=0.7.0" \
        --replace "requests==2.23.0" "requests~=2.24"
    '';
  
    meta = with lib; {
  
negative.code: 
  buildPythonApplication rec {
    pname = "aws-sam-cli";
    version = "1.6.2";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "0scnymhhiiqrs2j0jaypxgq2wg1qf1w8f55qfay0b3nf51y6mh8y";
    };
  
    # Tests are not included in the PyPI package
  