anchor.diff:  { lib
   , fetchPypi
  +, fetchpatch
   , buildPythonPackage
   , pytest
   , mock
  
positive.code:     description = "A Python SQL toolkit and Object Relational Mapper";
      license = licenses.mit;
    };
  }
negative.code: 
  buildPythonPackage rec {
    pname = "SQLAlchemy";
    version = "1.2.13";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "84412de3794acee05630e7788f25e80e81f78eb4837e7b71d0499129f660486a";
    };
  
    patches = [
      # fix for failing doc tests
      # https://bitbucket.org/zzzeek/sqlalchemy/issues/4370/sqlite-325x-docs-tutorialrst-doctests-fail
      (fetchpatch {
        name = "doc-test-fixes.patch";
        url = https://bitbucket.org/zzzeek/sqlalchemy/commits/63279a69e2b9277df5e97ace161fa3a1bb4f29cd/raw;
        sha256 = "1x25aj5hqmgjdak4hllya0rf0srr937k1hwaxb24i9ban607hjri";
      })
    ];
  
    checkInputs = [
      pytest
  