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

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

@@ -0,0 +1,24 @@
+{ stdenv, buildPythonPackage, fetchurl, pytest, mock }:
+buildPythonPackage rec {
+  pname = "pep257";
+  name = "${pname}-${version}";
+  version = "0.7.0";
+
+  src = fetchurl {
+    url = "https://github.com/GreenSteam/pep257/archive/${version}.tar.gz";
+    sha256 = "1ldpgil0kaf6wz5gvl9xdx35a62vc6bmgi3wbh9320dj5v2qk4wh";
+  };
+
+  buildInputs = [ pytest mock ];
+
+  checkPhase = ''
+    py.test
+  '';
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/GreenSteam/pep257/;
+    description = "Python docstring style checker";
+    longDescription = "Static analysis tool for checking compliance with Python PEP 257.";
+    license = licenses.mit;
+  };
+}