diff --git a/pkgs/development/python-modules/py/default.nix b/pkgs/development/python-modules/py/default.nix
new file mode 100644
index 00000000000..0dc3b679328
--- /dev/null
+++ b/pkgs/development/python-modules/py/default.nix
@@ -0,0 +1,20 @@
+{ stdenv, buildPythonPackage, fetchPypi }:
+buildPythonPackage rec {
+  pname = "py";
+  version = "1.4.34";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1qyd5z0hv8ymxy84v5vig3vps2fvhcf4bdlksb3r03h549fmhb8g";
+  };
+
+  # Circular dependency on pytest
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    description = "Library with cross-python path, ini-parsing, io, code, log facilities";
+    homepage = http://pylib.readthedocs.org/;
+    license = licenses.mit;
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f3ed5f89832..4a4f0231e15 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -17170,24 +17170,7 @@ in {
   };
 
 
-  py = buildPythonPackage rec {
-    name = "py-${version}";
-    version = "1.4.31";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/p/py/${name}.tar.gz";
-      sha256 = "a6501963c725fc2554dabfece8ae9a8fb5e149c0ac0a42fd2b02c5c1c57fc114";
-    };
-
-    # Circular dependency on pytest
-    doCheck = false;
-
-    meta = {
-      description = "Library with cross-python path, ini-parsing, io, code, log facilities";
-      homepage = http://pylib.readthedocs.org/;
-      license = licenses.mit;
-    };
-  };
+  py = callPackage ../development/python-modules/py { };
 
 
   pyacoustid = buildPythonPackage rec {