anchor.diff:  , fetchPypi
   , pythonAtLeast
   , isPy38
  +, isPy39
   , python
   , nose
   , mock
  
positive.code:     ${python.interpreter} tests/test.py default
    '';
  
    doCheck = !isPy38; # hmac functionality has changed
    checkInputs = [ nose mock ];
    propagatedBuildInputs = [ requests httpretty ];
  
  
negative.code: buildPythonPackage rec {
    pname = "boto";
    version = "2.49.0";
    disabled = pythonAtLeast "3.10"; # cannot import name 'Mapping' from 'collections'
  
    src = fetchPypi {
      inherit pname version;
  