Python: move expressions in python-modules to their own folders

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

@@ -0,0 +1,27 @@
+{ stdenv, buildPythonPackage, python, fetchurl
+, django_environ, mock, django, six
+, pytest, pytestrunner, pytest-django, setuptools_scm
+}:
+buildPythonPackage rec {
+  pname = "django-guardian";
+  name = "${pname}-${version}";
+  version = "1.4.9";
+
+  src = fetchurl {
+    url = "mirror://pypi/d/django-guardian/${name}.tar.gz";
+    sha256 = "c3c0ab257c9d94ce154b9ee32994e3cff8b350c384040705514e14a9fb7c8191";
+  };
+
+  buildInputs = [ pytest pytestrunner pytest-django django_environ mock setuptools_scm ];
+  propagatedBuildInputs = [ django six ];
+
+  checkPhase = ''
+    ${python.interpreter} nix_run_setup.py test --addopts="--ignore build"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Per object permissions for Django";
+    homepage = https://github.com/django-guardian/django-guardian;
+    licenses = [ licenses.mit licenses.bsd2 ];
+  };
+}