Merge pull request #148403 from elohmeier/py2-flake8

writers.makePythonWriter: disable flake8 checks for Python 2

pkgs/build-support/writers/default.nix

···
       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

pkgs/development/python-modules/flake8/default.nix

···
     pytestCheckHook
   ];
 
+  disabled = pythonOlder "3.6";
+
   meta = with lib; {
     description = "Flake8 is a wrapper around pyflakes, pycodestyle and mccabe.";
     homepage = "https://github.com/pycqa/flake8";