python2.pkgs.jaraco_functools: keep at 2.0 for python 2

pkgs/development/python-modules/jaraco_functools/2.nix

@@ -0,0 +1,25 @@
+{ lib, buildPythonPackage, fetchPypi
+, setuptools_scm
+, more-itertools, backports_functools_lru_cache }:
+
+buildPythonPackage rec {
+  pname = "jaraco.functools";
+  version = "2.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0ickpwvvdrlbm477gdzfjfcbgmfia9ksm9a3i3pbx9xia97r9fim";
+  };
+
+  propagatedBuildInputs = [ more-itertools backports_functools_lru_cache ];
+
+  doCheck = false;
+
+  buildInputs = [ setuptools_scm ];
+
+  meta = with lib; {
+    description = "Additional functools in the spirit of stdlib's functools";
+    homepage = "https://github.com/jaraco/jaraco.functools";
+    license = licenses.mit;
+  };
+}

pkgs/top-level/python-packages.nix

@@ -7037,7 +7037,10 @@ in {
 
   morphys = callPackage ../development/python-modules/morphys { };
 
-  jaraco_functools = callPackage ../development/python-modules/jaraco_functools { };
+  jaraco_functools = if pythonOlder "3.6" then
+    callPackage ../development/python-modules/jaraco_functools/2.nix { }
+  else
+    callPackage ../development/python-modules/jaraco_functools { };
 
   jaraco_classes = callPackage ../development/python-modules/jaraco_classes { };