gnome: rename from gnome3

Since GNOME version is now 40, it no longer makes sense to use the old attribute name.

pkgs/desktops/gnome/misc/nautilus-python/default.nix

@@ -0,0 +1,63 @@
+{ lib, stdenv
+, fetchurl
+, pkg-config
+, which
+, gtk-doc
+, docbook_xsl
+, docbook_xml_dtd_412
+, python3
+, ncurses
+, nautilus
+, gtk3
+, gnome
+}:
+
+stdenv.mkDerivation rec {
+  pname = "nautilus-python";
+  version = "1.2.3";
+
+  outputs = [ "out" "dev" "doc" ];
+
+  src = fetchurl {
+    url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
+    sha256 = "161050sx3sdxqcpjkjcpf6wl4kx0jydihga7mcvrj9c2f8ly0g07";
+  };
+
+  nativeBuildInputs = [
+    pkg-config
+    which
+    gtk-doc
+    docbook_xsl
+    docbook_xml_dtd_412
+  ];
+
+  buildInputs = [
+    python3
+    ncurses # required by python3
+    python3.pkgs.pygobject3
+    nautilus
+    gtk3 # required by libnautilus-extension
+  ];
+
+  makeFlags = [
+    "PYTHON_LIB_LOC=${python3}/lib"
+  ];
+
+  PKG_CONFIG_LIBNAUTILUS_EXTENSION_EXTENSIONDIR = "${placeholder "out"}/lib/nautilus/extensions-3.0";
+
+  passthru = {
+    updateScript = gnome.updateScript {
+      packageName = pname;
+      attrPath = "gnome.${pname}";
+      versionPolicy = "odd-unstable";
+    };
+  };
+
+  meta = with lib; {
+    description = "Python bindings for the Nautilus Extension API";
+    homepage = "https://wiki.gnome.org/Projects/NautilusPython";
+    license = licenses.gpl2Plus;
+    maintainers = teams.gnome.members;
+    platforms = platforms.unix;
+  };
+}