anchor.diff:  
       buildInputs = with self;
         [
  -        hypothesis
  +        hypothesis1
           pytestcov
           pytestflakes
           pytestpep8
  
positive.code:     };
  
      buildInputs = [ pkgs.openssl self.pretend self.cryptography_vectors
                      self.iso8601 self.pyasn1 self.pytest self.py self.hypothesis ]
                 ++ optional stdenv.isDarwin pkgs.darwin.apple_sdk.frameworks.Security;
      propagatedBuildInputs = with self; [ six idna ipaddress pyasn1 cffi pyasn1-modules modules.sqlite3 ]
       ++ optional (pythonOlder "3.4") self.enum34;
  
negative.code:     };
    };
  
    hypothesis1 = buildPythonPackage rec {
      name = "hypothesis-1.14.0";
  
      buildInputs = with self; [fake_factory django numpy pytz flake8 pytest ];
  