python.pkgs.networkx: move expression

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

@@ -0,0 +1,34 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, nose
+, decorator
+, isPy36
+, isPyPy
+}:
+
+buildPythonPackage rec {
+  pname = "networkx";
+  version = "1.11";
+
+  # Currently broken on PyPy.
+  # https://github.com/networkx/networkx/pull/1361
+  disabled = isPyPy;
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1f74s56xb4ggixiq0vxyfxsfk8p20c7a099lpcf60izv1php03hd";
+  };
+
+  checkInputs = [ nose ];
+  propagatedBuildInputs = [ decorator ];
+
+  # 17 failures with 3.6 https://github.com/networkx/networkx/issues/2396#issuecomment-304437299
+  doCheck = !(isPy36);
+
+  meta = {
+    homepage = "https://networkx.github.io/";
+    description = "Library for the creation, manipulation, and study of the structure, dynamics, and functions of complex networks";
+    license = lib.licenses.bsd3;
+  };
+}