anchor.diff:  { lib, buildPythonPackage, fetchPypi, pythonOlder, isPy27
   , decorator
  +, http-parser
   , importlib-metadata
   , python
   , python_magic
  
positive.code: 
    propagatedBuildInputs = [
      decorator
      python_magic
      urllib3
      six
  
negative.code: 
  buildPythonPackage rec {
    pname = "mocket";
    version = "3.9.0";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "1n1h9xbi1my0vgjsh7mfkd51qfa6imjzxnwqccsvshqa8grcv1wm";
    };
  
    patchPhase = ''
  