python.pkgs.aiodns : move to separate expression

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

@@ -0,0 +1,30 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, isPy33, isPy26, isPy27, isPyPy, python, pycares, asyncio, trollius }:
+
+buildPythonPackage rec {
+  pname = "aiodns";
+  version = "1.0.1";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "595b78b8d54115d937cf60d778c02dad76b6f789fd527dab308f99e5601e7f3d";
+  };
+
+  propagatedBuildInputs = with stdenv.lib; [ pycares ] 
+    ++ optional isPy33 asyncio 
+    ++ optional (isPy26 || isPy27 || isPyPy) trollius;
+
+  checkPhase = ''
+    ${python.interpreter} tests.py
+  '';
+
+  # 'Could not contact DNS servers'
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    homepage = http://github.com/saghul/aiodns;
+    license = licenses.mit;
+    description = "Simple DNS resolver for asyncio";
+  };
+}