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

pkgs/development/python-modules/pytest-pep257/default.nix

@@ -0,0 +1,21 @@
+{ stdenv, buildPythonPackage, fetchurl, pytest, pep257 }:
+
+buildPythonPackage rec {
+  pname = "pytest-pep257";
+  name = "${pname}-${version}";
+  version = "0.0.5";
+
+  src = fetchurl {
+    url = "mirror://pypi/p/pytest-pep257/${name}.tar.gz";
+    sha256 = "082v3d5k4331x53za51kl8zxsndsw1pcyf1xdfpb2gjdjrhixb8w";
+  };
+
+  buildInputs = [ pytest ];
+  propagatedBuildInputs = [ pep257 ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/anderslime/pytest-pep257;
+    description = "py.test plugin for PEP257";
+    license = licenses.mit;
+  };
+}