anchor.diff:  
     postPatch = ''
      substituteInPlace requirements.txt \
  +     --replace "pendulum==2.0.4" "pendulum>=2.0.4" \
        --replace "click-completion==0.5.0" "click-completion>=0.5.0" \
        --replace "pbr==5.1.2" "pbr>=5.1.2" \
        --replace "inquirer==2.5.1" "inquirer>=2.5.1"
  
positive.code: { stdenv, buildPythonPackage, fetchPypi, twine, pbr, click, click-completion, validate-email,
  pendulum, ptable, requests, inquirer, pythonOlder, pytest, pytestcov, pytest-mock, faker, factory_boy }:
  
  
  buildPythonPackage rec {
  
negative.code:   '';
  
    propagatedBuildInputs = [
      setuptools
      click
      click-completion
      validate-email
  