writers.makePythonWriter: drop flake8 checks for Python 2 scripts

      then "${python}/bin/python"

      else "${python.withPackages (ps: libraries)}/bin/python"

    ;

    check = writeDash "python2check.sh" ''

    check = optionalString python.isPy3k (writeDash "pythoncheck.sh" ''

      exec ${pythonPackages.flake8}/bin/flake8 --show-source ${ignoreAttribute} "$1"

    '';

    '');

  } name;

  # writePython2 takes a name an attributeset with libraries and some python2 sourcecode and